Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Arcbound Ravager, and Clockwork Hydra

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Arcbound Ravager on the battlefield
• Clockwork Hydra on the battlefield

Steps

1. Activate Arcbound Ravager by sacrificing Clockwork Hydra
2. When Clockwork Hydra dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect
3. Resolve the Arcbound Ravager ability
4. Repeat
5. Kill Arcbound Ravager
6. When Arcbound Ravager dies, its persist ability triggers, returning Arcbound Ravager from your graveyard to the battlefield
7. It will have no counters on it due to its modular ability
8. Arcbound Ravager dies as a state-based action due to having 0 toughness Repeat from step 2

Results

• Draw the game
• Infinite +1/+1 counters on a creature
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers