Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Geralf's Mindcrusher, and Bloodthrone Vampire

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Geralf's Mindcrusher on the battlefield
• Bloodthrone Vampire on the battlefield

Steps

1. Activate Bloodthrone Vampire by sacrificing Geralf's Mindcrusher When Geralf's Mindcrusher dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
2. When Geralf's Mindcrusher enters, it triggers, causing a player to mill 5 cards
3. Activate Bloodthrone Vampire by sacrificing Geralf's Mindcrusher When Geralf's Mindcrusher dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
4. When Geralf's Mindcrusher enters, it triggers, causing a player to mill 5 cards
5. Resolve both Bloodthrone Vampire abilities from step 1 and 4
6. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mill
• Infinite self-mill
• Infinitely large creature until end of turn