Number 98: Antitopian (Common)

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.