Kairyu-Shin Leviathan

This spell can't be countered.

At the beginning of each upkeep, create a 3/3 blue Serpent creature token named Kairyu-Shin'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.