Koma, Cosmos Serpent [Kaldheim] Elf Ranger Set: Throne of Eldraine Type:

Set: Throne of Eldraine Type: Creature — Turtle Hydra Rarity: Rare Cost: {X}{G}{G} Steelbane Hydra enters the battlefield with X +1/+1 counters on it

but it is predictable

" —Mercadian magistrate

untap target creature

Enchanted creature gets +X/+Y

Koma, Cosmos Serpent [Kaldheim] Elf Ranger Set: Throne of Eldraine Type:Set: Kaldheim Type: Legendary Creature Serpent Rarity: Mythic Cost: {3}{G}{G}{U}{U} This spell can't be countered. At the beginning of each upkeep, create a 3 3 blue Serpent creature token named Koma's Coil. Sacrifice another Serpent: Choose one Tap target permanent. Its activated abilities can't be activated this turn. Koma, Cosmos Serpent gains indestructible until end of turn.