Aura Astral Slayer

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.
• Aura Astral Slayer gains indestructible until end of turn. This card is a copy of Koma Cosmos Serpent