Plastic Man, Ever-Elastic

(Proxy for Koma, Cosmos Serpent)
This spell can't be countered.
At the beginning of each upkeep, create a 3/3 blue Serpent creature token named Plastic Man's Coil.

Sacrifice another Serpent: Choose one —
• Tap target permanent. Its activated abilities can't
be activated this turn.
• Plastic Man gains indestructible until end of turn.