Merfolk Observer

Spawning Breath deals 1 damage to any target. Create a 0/1 colorless Eldrazi Spawn creature token. It has "Sacrifice this token: Add C."

(T: Add B.)

Whenever this creature blocks or becomes blocked by a creature with power 1 or less, destroy this creature at end of combat.

Flame Slash deals 4 damage to target creature.

Target player sacrifices a creature of their choice. You gain life equal to that creature's toughness. Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

(T: Add G.)

Search your library for up to four land cards with different names and reveal them. An opponent chooses two of those cards. Put the chosen cards into your graveyard and the rest into your hand. Then shuffle.

(T: Add W.)