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

Prerequisites

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

Steps

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

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite lifeloss
• Infinitely large creature until end of turn