The Mimeoplasm [Secret Lair Drop Series] Monarch Unlimited You can only use this

You can only use this effect of “Sinister Serpent” once per turn

If "Malefic World" is not face-up on the field

Set: Phantom Darkness Card type: Effect Monster Rarity: Secret Rare Attack: 4000 Defense: 0 This card cannot be Normal Summoned or Set

Set: Cosmo Blazer Card type: Effect Monster Rarity: Ultimate Rare Attack: 1700 Defense: 2400 You can discard 1 other WATER monster to the Graveyard

The Mimeoplasm [Secret Lair Drop Series] Monarch Unlimited You can only use thisSet: Secret Lair Drop Series Type: Legendary Creature Ooze Rarity: Mythic Cost: {2}{B}{G}{U} As The Mimeoplasm enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1 +1 counters on it equal to the power of the other card.