Charnelhoard Wurm + Savage Beating + Sozin's Comet
Charnelhoard Wurm
Savage Beating
Sozin's Comet
Infinite storm countInfinite combat phasesInfinite untap of creatures you controlInfinite mana creatures you control can produceInfinite magecraft triggersInfinite combat damage
How it works
Cast Sozin's Comet by paying 3.
Declare Charnelhoard Wurm as an attacker, triggering its firebending ability, adding .
Holding priority, cast Savage Beating by paying 3, causing you to untap all creatures you control and get an additional combat phase after this one.
Deal combat damage using Charnelhoard Wurm, triggering its ability, returning Savage Beating from your graveyard to your hand.