Worldgorger Dragon

世界喰らいのドラゴン (Worldgorger Dragon) (ja)

Creature - Nightmare Dragon | Power/Toughness: 7 / 7 (CMC 6)
Flying, trample
When Worldgorger Dragon enters the battlefield, exile all other permanents you control.
When Worldgorger Dragon leaves the battlefield, return the exiled cards to the battlefield under their owners' control.