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That Time I Got Reincarnated as a Slime has 277 cards in the Union Arena card game so far, across 2 sets. The most valuable is Rimuru (Regionals 26-27) (UEPR/TSK-1-053) at $581.25.
Rimuru (Regionals 26-27)
UEPR/TSK-1-053 · Super Rare
$581.25
Luminus (048) (SR**)
UE20BT/TSK-2-048 · Super Rare 2-Star
$324.06
Hinata (034) (SR**)
UE20BT/TSK-2-034 · Super Rare 2-Star
$323.96
Milim (085) (SR**)
UE20BT/TSK-1-085 · Super Rare 2-Star
$311.07
Rimuru (044) (SR**)
UE20BT/TSK-2-044 · Super Rare 2-Star
$292.68
Rimuru (107) (Box Topper Gold Foil)
UE20BT/TSK-1-107 · Super Rare 1-Star
$273.01
Shion (053) (SR**)
UE20BT/TSK-2-053 · Super Rare 2-Star
$252.22
Rimuru (091) (SR**)
UE20BT/TSK-1-091 · Super Rare 2-Star
$220.46
Benimaru (027) (SR**)
UE20BT/TSK-1-027 · Super Rare 2-Star
$193.64
Shizu (043) (SR**)
UE20BT/TSK-1-043 · Super Rare 2-Star
$192.00
Rimuru (044) (Winner)
UEPR/TSK-2-044 · Union Rare
$187.56
Action Point Card (AP01)
UE20BT/TSK-1-AP01 · Action Point
$141.51
