Celestial Transformation [DR04-EN224] Rare Generation Force SE You can only use this

You can only use this effect of "Mermail Abyssteus" once per turn

you can Tribute this face-up monster to destroy all face-up Attack Position monsters your opponent controls and inflict damage to your opponent equal to the combined original ATK of those destroyed monster(s)

If this face-up card would be destroyed

Set: Astral Pack 7 Card type: Xyz/Effect Monster Rarity: Ultimate Rare Attack: 2600 Defense: 2100 2 Level 7 monsters You can also Xyz Summon this card by using a Rank 5 or 6 Xyz Monster you control as the Xyz Material

Celestial Transformation [DR04-EN224] Rare Generation Force SE You can only use thisSet: Dark Revelation Volume 4 Card type: Quick Play Spell Rarity: Rare Special Summon 1 Fairy Type monster from your hand. That monster's ATK is halved, and it is destroyed during the End Phase.