Mermail Abyssteus [CBLZ-EN083] Ultimate Rare BW004 Set: Core Set 2020 Prerelease

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

Set: Core Set 2020 Type: Land Rarity: Rare Field of the Dead enters the battlefield tapped

If this face-up card would be destroyed

Set: Alpha Edition Type: Sorcery Rarity: Rare Cost: {X}{U}{U}{U} Destroy X target Mountains

Whenever an opponent casts a creature or planeswalker spell with the same name as a card in their graveyard

Mermail Abyssteus [CBLZ-EN083] Ultimate Rare BW004 Set: Core Set 2020 PrereleaseSet: 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.