Dagon, Voice of the Abyss

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.