Evilswarm Bahamut (HA07-EN024) - Hidden Arsenal 7: Knight of Stars 1st Edition

2 Level 4 "lswarm" monsters // Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up monster your opponent controls; discard 1 "lswarm" monster, and if you do, take control of that opponent's monster.