2 Level 4 monsters

When any player's monster declares an attack: You can detach 1 Xyz Material from this card; change that monster to Defense Position. During either player's turn, while this card is in your Graveyard: You can target 1 "Utopia" monster on the field; Special Summon this card in Defense Position, and if you do, attach that monster to this card as an Xyz Material. You can only use this effect of "Number 98: Antitopian" once per turn.