At the start of the Damage Step, if your "U.A." monster battles an opponent's monster: You can banish that opponent's monster until your opponent's 2nd End Phase. You can only use this effect of "U.A. Penalty Box" once per turn. You can banish this card from your Graveyard; add 1 "U.A." Spell Card from your Deck to your hand.
Paleozoic Marella is the real mvp, it sends penalty box to the graveyard and you get to draw an ultra stadium. Goddamn, totally busted, whoever thinks U.A. are weak have no idea, maybe they will receive more support in the future. It claps !
U.A. is a pretty cool archetype, I always laughed at people who thought Cyber Style nerf ruined the deck. One guy at duel links meta even WON A TOURNAMENT PLAYING U.A. he won like 150$ or something, probably a bit more, maybe 200
Well,this card works by banishing the monster your monster yse to attack and after you pass 2 tirns,you return the banished monster back to your opponent.That means by that time,your opponent would have summoned nonsters to replace the banished monster and when you return them the banished monster, since the card slot will be filled with monsters,it gets auto destroyed.