Zinnia, Valley's Voice, Nesting Dovehawk, Combat Celebrant, and Dragonlord Kolaghan

Prerequisites

• Zinnia, Valley's Voice on the battlefield
• Nesting Dovehawk on the battlefield
• Combat Celebrant in hand
• Dragonlord Kolaghan on the battlefield
• available

Steps

1. Cast Combat Celebrant by paying plus an additional for its offspring cost
2. When Combat Celebrant enters, its offspring ability triggers, creating a token copy of it that is 1/1
3. At the beginning of your combat phase, Nesting Dovehawk triggers, creating a copy of the Combat Celebrant token
4. Declare a Combat Celebrant token as an attacker, choosing to exert it as it attacks
5. It then triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one
6. Repeat from step 3 each combat phase

Results

• Infinite +1/+1 counters on a creature
• Infinite combat phases
• Infinite creature ETB
• Infinite creature tokens with haste
• Infinitely powerful creature until end of turn