Ghyrson Starn, Kelermorph + Temple Altisaur + Frilled Deathspitter + 1 more

Give Frilled Deathspitter indestructible by any method.

Deal damage to Frilled Deathspitter, with all but 1 of that damage being prevented by Temple Altisaur.

Frilled Deathspitter, Ghyrson Starn, and Spark Double trigger.

Resolve the Ghyrson Starn trigger, dealing 2 damage to Frilled Deathspitter, with all but 1 of that damage being prevented by Temple Altisaur.

Spark Double and Frilled Deathspitter trigger.

Resolve the Frilled Deathspitter trigger, dealing 2 damage to target opponent.

Resolve the Spark Double trigger, dealing 2 damage to Frilled Deathspitter, with all but 1 of that damage being prevented by Temple Altisaur.

Ghyrson Starn and Frilled Deathspitter trigger.

Repeat from step 4.