Mermail Abyssteus [CBLZ-EN083] Ultimate Rare BW004 Set: Onslaught Type: Enchantment Rarity:

Set: Onslaught Type: Enchantment Rarity: Rare Cost: {1}{B} As Cover of Darkness enters the battlefield

Set: EX: Unseen Forces Type: Colorless Rarity: Uncommon Retreat cost: Colorless

If this face-up card would be destroyed

Set: Core Set 2020 Prerelease Promos Type: Creature — Human Rogue Rarity: Rare Cost: {5}{U}{U} When Agent of Treachery enters the battlefield

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {U} Counter target activated or triggered ability

Mermail Abyssteus [CBLZ-EN083] Ultimate Rare BW004 Set: Onslaught Type: Enchantment Rarity:Set: Cosmo Blazer Card type: Effect Monster Rarity: Ultimate Rare Attack: 1700 Defense: 2400 You can discard 1 other WATER monster to the Graveyard; Special Summon this card from your hand. When you do: Add 1 Level 4 or lower "Mermail" monster from your Deck to your hand. You can only use this effect of "Mermail Abyssteus" once per turn.