Dimension Fusion (IOC-EN094) - Invasion of Chaos (25th Anniversary Edition) Unlimited Number_LOB-122 Once per turn: You can

Once per turn: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position

or only Xyz Monsters: You can Special Summon this card from your hand

and if you do

Send 1 monster card from your hand to the Graveyard to destroy all face-up monsters on your opponent's side of the field with an ATK equal to or less than the ATK of the sent monster

Dimension Fusion (IOC-EN094) - Invasion of Chaos (25th Anniversary Edition) Unlimited Number_LOB-122 Once per turn: You canTypenull Normal Spell AttributeSPELL Card TextPay 2000 Life Points. Both players Special Summon as many of their removed from play monsters as possible.