Union Arena

UE12BT Kaiju No. 8

Released October 31, 2025

Cards: 120
Master set value: $1,423.10
Booster box: $96.62
Top card: $188.67

Open or Hold?

Hold it

Opening loses money on average. Keep it sealed or buy the singles you want.

Hold it

Low confidence estimate

Sealed box price: $96.62
Average box, opened: $51.52
Typical box, opened: $39.56
Chance a box beats its price: 7%

We simulated 10,000 box openings using today's market prices. 8 in 10 boxes land between $22.04 and $80.23. Sealed, this box is up 21% from its $79.84 release price. Selling pulled cards costs roughly 13% in marketplace fees plus shipping, so real returns are lower.

Box price vs. value opened

Sealed box priceAverage box openedTypical box opened

Where the value comes from

Pull	Per box	Avg card	Adds to box	Best card
Super Rare	6	$2.46	$14.75	Reno Ichikawa (012) · $8.07
1-star parallel	1	$13.69	$13.69	Reno Ichikawa (012) (SR*) · $28.42
2-star parallel	1 in 16	$149.96	$9.37	Kikoru Shinomiya (020) (SR**) · $188.67
Common	120	$0.05	$5.84	Reno Ichikawa (009) · $0.05
Action Point	2	$1.85	$3.70	Action Point Card (AP01) · $3.00
Uncommon	48	$0.05	$2.40	Mina Ashiro (002) · $0.05
Rare	10	$0.11	$1.12	Mina Ashiro (003) · $0.15
Box topper	1	$0.65	$0.65	Reno Ichikawa (009) (Box Topper Foil) · $1.19
3-star parallel	1 in 50	$0.00	$0.00	—

How we calculate this · confidence: Low

A box has 16 packs of 12 cards. Pull rates aren't published by the maker, so we use community case-opening data. Every card of a rarity is treated as equally likely.

Rates per box: about 6 Super Rares, 1 one-star parallel, 2 Action Points, one 2-star parallel per 16-box case, and 3-star parallels at a few per hundred boxes. Every box includes one box topper.

English Union Arena pull data is thin (a few boxes plus Japanese data), so this is a rough guide.

Rare silver/gold box toppers and special-art Action Point cards are left out because nobody has published how often they appear, so this estimate may be a little low.

Bulk commons and uncommons are counted at 5¢ each.

Track this set: see how much of it you own and what it costs to finish.

Sealed products

Kaiju No. 8 - Booster Box Case

Sealed

$1,300.00

Kaiju No. 8 - Booster Box

Sealed

$96.62

Kaiju No. 8 - Booster Pack

Sealed

$7.05

Kaiju No. 8 - Box Promotion Pack

Sealed

$3.67

Cards

120 cards

Kikoru Shinomiya (020) (SR**)

UE12BT/KJ8-1-020 · Super Rare 2-Star

$188.67

Kaiju No. 8 (055) (SR**)

UE12BT/KJ8-1-055 · Super Rare 2-Star

$181.99

Mina Ashiro (005) (SR**)

UE12BT/KJ8-1-005 · Super Rare 2-Star

$155.02

Reno Ichikawa (012) (SR**)

UE12BT/KJ8-1-012 · Super Rare 2-Star

$139.16

Kafka Hibino (063) (SR**)

UE12BT/KJ8-1-063 · Super Rare 2-Star

$119.20

Soshiro Hoshina (071) (SR**)

UE12BT/KJ8-1-071 · Super Rare 2-Star

$115.71

Action Point Card (AP05)

UE12BT/KJ8-1-AP05 · Action Point

$69.83

Action Point Card (AP03)

UE12BT/KJ8-1-AP03 · Action Point

$50.92

Action Point Card (AP02)

UE12BT/KJ8-1-AP02 · Action Point

$50.51

Action Point Card (AP01)

UE12BT/KJ8-1-AP01 · Action Point

$38.95

Action Point Card (AP04)

UE12BT/KJ8-1-AP04 · Action Point

$28.83

Reno Ichikawa (012) (SR*)

UE12BT/KJ8-1-012 · Super Rare 1-Star

$28.42

Mina Ashiro (004) (SR*)

UE12BT/KJ8-1-004 · Super Rare 1-Star

$28.41

Action Point Card (AP06)

UE12BT/KJ8-1-AP06 · Action Point

$28.31

Kaiju No. 8 (054) (SR*)

UE12BT/KJ8-1-054 · Super Rare 1-Star

$27.02

Mina Ashiro (005) (SR*)

UE12BT/KJ8-1-005 · Super Rare 1-Star

$26.19

Kikoru Shinomiya (020) (SR*)

UE12BT/KJ8-1-020 · Super Rare 1-Star

$19.05

Kafka Hibino (063) (SR*)

UE12BT/KJ8-1-063 · Super Rare 1-Star

$18.97

Kikoru Shinomiya (019) (SR*)

UE12BT/KJ8-1-019 · Super Rare 1-Star

$16.12

Mina Ashiro (003) (R*)

UE12BT/KJ8-1-003 · Rare 1-Star

$10.88

Soshiro Hoshina (070) (SR*)

UE12BT/KJ8-1-070 · Super Rare 1-Star

$9.59

Reno Ichikawa (012)

UE12BT/KJ8-1-012 · Super Rare

$8.07

Kafka Hibino (062) (R*)

UE12BT/KJ8-1-062 · Rare 1-Star

$7.39

Soshiro Hoshina (031) (R*)

UE12BT/KJ8-1-031 · Rare 1-Star

$7.14

Kikoru Shinomiya (059) (R*)

UE12BT/KJ8-1-059 · Rare 1-Star

$5.77

Reno Ichikawa (050) (R*)

UE12BT/KJ8-1-050 · Rare 1-Star

$5.65

Iharu Furuhashi (028) (R*)

UE12BT/KJ8-1-028 · Rare 1-Star

$5.03

Kafka Hibino (063)

UE12BT/KJ8-1-063 · Super Rare

$3.38

Kaiju No. 8 (054)

UE12BT/KJ8-1-054 · Super Rare

$3.11

Kaiju No. 8 (055)

UE12BT/KJ8-1-055 · Super Rare

$2.98

Mina Ashiro (005)

UE12BT/KJ8-1-005 · Super Rare

$2.94

Haruichi Izumo (008) (U*)

UE12BT/KJ8-1-008 · Uncommon 1-Star

$1.87

Aoi Kaguragi (015) (U*)

UE12BT/KJ8-1-015 · Uncommon 1-Star

$1.54

Reno Ichikawa (009) (Box Topper Foil)

UE12BT/KJ8-1-009 · Common

$1.19

Mina Ashiro (004)

UE12BT/KJ8-1-004 · Super Rare

$1.04

Kikoru Shinomiya (019)

UE12BT/KJ8-1-019 · Super Rare

$0.99

Action Point Card (AP08)

UE12BT/KJ8-1-AP08 · Action Point

$0.90

Soshiro Hoshina (071)

UE12BT/KJ8-1-071 · Super Rare

$0.88

Kikoru Shinomiya (016) (Box Topper Foil)

UE12BT/KJ8-1-016 · Common

$0.82

Kikoru Shinomiya (020)

UE12BT/KJ8-1-020 · Super Rare

$0.70

Kafka Hibino (060) (Box Topper Foil)

UE12BT/KJ8-1-060 · Common

$0.57

Soshiro Hoshina (070)

UE12BT/KJ8-1-070 · Super Rare

$0.50

Action Point Card (AP10)

UE12BT/KJ8-1-AP10 · Action Point

$0.49

Soshiro Hoshina (066) (Box Topper Foil)

UE12BT/KJ8-1-066 · Common

$0.38

Action Point Card (AP07)

UE12BT/KJ8-1-AP07 · Action Point

$0.34

Action Point Card (AP09)

UE12BT/KJ8-1-AP09 · Action Point

$0.31

Action Point Card (AP11)

UE12BT/KJ8-1-AP11 · Action Point

$0.31

This Is Who I Am Right Now

UE12BT/KJ8-1-036 · Uncommon

$0.29

Mina Ashiro (041) (Box Topper Foil)

UE12BT/KJ8-1-041 · Common

$0.29

Now Leave the Rest to Me

UE12BT/KJ8-1-074 · Uncommon

$0.24

Unleashed Combat Power, 96%

UE12BT/KJ8-1-035 · Uncommon

$0.18

Mina Ashiro (003)

UE12BT/KJ8-1-003 · Rare

$0.15

Mina Ashiro (002)

UE12BT/KJ8-1-002 · Uncommon

$0.14

Soshiro Hoshina (029)

UE12BT/KJ8-1-029 · Common

$0.14

Soshiro Hoshina (030)

UE12BT/KJ8-1-030 · Uncommon

$0.14

Soshiro Hoshina (031)

UE12BT/KJ8-1-031 · Rare

$0.14

Mina Ashiro (044)

UE12BT/KJ8-1-044 · Rare

$0.14

Bakko (022)

UE12BT/KJ8-1-022 · Common

$0.13

Bakko (023)

UE12BT/KJ8-1-023 · Uncommon

$0.13

Kafka Hibino (061)

UE12BT/KJ8-1-061 · Uncommon

$0.13

Kafka Hibino (062)

UE12BT/KJ8-1-062 · Rare

$0.13

Mina Ashiro (001)

UE12BT/KJ8-1-001 · Common

$0.12

Reno Ichikawa (009)

UE12BT/KJ8-1-009 · Common

$0.12

Now It's Time For Me to Shoot My Foe

UE12BT/KJ8-1-037 · Uncommon

$0.12

Brace Yourself

UE12BT/KJ8-1-077 · Rare

$0.12

Reno Ichikawa (010)

UE12BT/KJ8-1-010 · Uncommon

$0.11

Squadron-Style Axe Technique Number One - Falling Thunder

UE12BT/KJ8-1-040 · Rare

$0.11

Reno Ichikawa (050)

UE12BT/KJ8-1-050 · Rare

$0.11

Kikoru Shinomiya (059)

UE12BT/KJ8-1-059 · Rare

$0.11

Soshiro Hoshina (068)

UE12BT/KJ8-1-068 · Uncommon

$0.11

Konomi Okonogi (052)

UE12BT/KJ8-1-052 · Uncommon

$0.10

Kafka Hibino (060)

UE12BT/KJ8-1-060 · Common

$0.10

Iharu Furuhashi (064)

UE12BT/KJ8-1-064 · Common

$0.10

Soshiro Hoshina (069)

UE12BT/KJ8-1-069 · Rare

$0.10

Haruichi Izumo (008)

UE12BT/KJ8-1-008 · Uncommon

$0.09

Iharu Furuhashi (026)

UE12BT/KJ8-1-026 · Common

$0.09

Defense Force's Tachikawa Base

UE12BT/KJ8-1-033 · Uncommon

$0.09

Mina Ashiro (041)

UE12BT/KJ8-1-041 · Common

$0.09

Haruichi Izumo (047)

UE12BT/KJ8-1-047 · Uncommon

$0.09

Reno Ichikawa (048)

UE12BT/KJ8-1-048 · Common

$0.09

Reno Ichikawa (049)

UE12BT/KJ8-1-049 · Uncommon

$0.09

Kaiju No. 8 (053)

UE12BT/KJ8-1-053 · Uncommon

$0.09

Soshiro Hoshina (067)

UE12BT/KJ8-1-067 · Common

$0.09

Fortitude 9.8

UE12BT/KJ8-1-078 · Common

$0.09

Hoshina-Style Sword-Slay Technique Number Six: Eightfold Slasher

UE12BT/KJ8-1-079 · Uncommon

$0.09

Hakua Igarashi

UE12BT/KJ8-1-006 · Common

$0.08

Reno Ichikawa (011)

UE12BT/KJ8-1-011 · Rare

$0.08

Kikoru Shinomiya (017)

UE12BT/KJ8-1-017 · Uncommon

$0.08

Kafka Hibino (024)

UE12BT/KJ8-1-024 · Common

$0.08

Kafka Hibino (025)

UE12BT/KJ8-1-025 · Uncommon

$0.08

Iharu Furuhashi (027)

UE12BT/KJ8-1-027 · Uncommon

$0.08

Iharu Furuhashi (028)

UE12BT/KJ8-1-028 · Rare

$0.08

A6-Grade Marbled Japanese Black Wagyu Beef

UE12BT/KJ8-1-034 · Common

$0.08

Screening Exam

UE12BT/KJ8-1-038 · Uncommon

$0.08

Accepting Applicants

UE12BT/KJ8-1-039 · Common

$0.08

Mina Ashiro (043)

UE12BT/KJ8-1-043 · Uncommon

$0.08

Kikoru Shinomiya (057)

UE12BT/KJ8-1-057 · Common

$0.08

Kikoru Shinomiya (058)

UE12BT/KJ8-1-058 · Uncommon

$0.08

Iharu Furuhashi (065)

UE12BT/KJ8-1-065 · Uncommon

$0.08

Monster Sweeper Inc.

UE12BT/KJ8-1-073 · Uncommon

$0.08

Fire Training Exercise

UE12BT/KJ8-1-076 · Uncommon

$0.08

Haruichi Izumo (007)

UE12BT/KJ8-1-007 · Common

$0.07

Kikoru Shinomiya (018)

UE12BT/KJ8-1-018 · Rare

$0.07

Akari Minase (032)

UE12BT/KJ8-1-032 · Common

$0.07

Ryo Ikaruga

UE12BT/KJ8-1-045 · Common

$0.07

Haruichi Izumo (046)

UE12BT/KJ8-1-046 · Common

$0.07

Soshiro Hoshina (066)

UE12BT/KJ8-1-066 · Common

$0.07

Childhood Promise

UE12BT/KJ8-1-075 · Common

$0.07

Aoi Kaguragi (015)

UE12BT/KJ8-1-015 · Uncommon

$0.06

Kikoru Shinomiya (016)

UE12BT/KJ8-1-016 · Common

$0.06

Mina Ashiro (042)

UE12BT/KJ8-1-042 · Common

$0.06

Aoi Kaguragi (056)

UE12BT/KJ8-1-056 · Uncommon

$0.06

Konomi Okonogi (051)

UE12BT/KJ8-1-051 · Common

$0.05

Akari Minase (072)

UE12BT/KJ8-1-072 · Common

$0.05

Found You

UE12BT/KJ8-1-080 · Common

$0.05

Konomi Okonogi (013)

UE12BT/KJ8-1-013 · Common

$0.04

Tae Nakanoshima

UE12BT/KJ8-1-021 · Common

$0.04

Aoi Kaguragi (014)

UE12BT/KJ8-1-014 · Common

$0.03

Kaiju No. 8 (055) (SR***)

UE12BT/KJ8-1-055 · Super Rare 3-Star

—

Kaiju No. 8 (055) (SR***) (Serial Numbered)

UE12BT/KJ8-1-055 · Super Rare 3-Star

—

…