Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Krark-Clan Grunt, and Clockwork Hydra

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Krark-Clan Grunt on the battlefield
• Clockwork Hydra on the battlefield

Steps

1. Activate Krark-Clan Grunt 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 Krark-Clan Grunt ability
4. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers
• Infinitely powerful creature until end of turn
• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers