Squall, SeeD Mercenary, Combat Celebrant, and Bloodflow Connoisseur

Prerequisites

• Squall, SeeD Mercenary on the battlefield
• Combat Celebrant on the battlefield
• Bloodflow Connoisseur on the battlefield

Steps

1. Declare Squall and Combat Celebrant as attackers, choosing to exert Combat Celebrant as it attacks
2. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one
3. Holding priority, activate Bloodflow Connoisseur by sacrificing Combat Celebrant
4. Deal combat damage to an opponent using Squall, triggering Squall's second ability, returning Combat Celebrant from your graveyard to the battlefield
5. Repeat each combat phase

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite combat phases
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite combat damage
• Infinite +1/+1 counters on Bloodflow Connoisseur