Infinite combat damageInfinite combat phasesInfinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite death triggersInfinite mana creatures you control can produceInfinite untap of creatures you controlInfinitely large creature until end of turn
How it works
Declare Squall and Combat Celebrant as attackers, choosing to exert Combat Celebrant as it attacks.
Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
Holding priority, activate Bloodthrone Vampire by sacrificing Combat Celebrant.
Deal combat damage to an opponent using Squall, triggering Squall's second ability, returning Combat Celebrant from your graveyard to the battlefield.