Massimo, the Magician, Combat Celebrant, Yarus, Roar of the Old Gods, and Daydream

Prerequisites

• Massimo, the Magician in hand
• Combat Celebrant on the battlefield
• Yarus, Roar of the Old Gods on the battlefield
• Daydream in the graveyard
• available

Steps

1. Cast Massimo by paying its mana cost When Massimo enters, it triggers, exiling Daydream from your graveyard and giving Massimo the listed ability
2. Declare Massimo and Combat Celebrant as attackers, choosing to exert Combat Celebrant as it attacks
3. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one
4. Deal combat damage with Massimo
5. Its ability triggers, casting a copy of Daydream from exile without paying its mana cost
6. Resolve Daydream, blinking Combat Celebrant
7. Repeat from step 3 each combat phase

Results

• Infinite combat damage
• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite magecraft triggers
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of creatures you control