Bloodthrone Vampire, and Warden of the Grove

Prerequisites

• Bloodthrone Vampire on the battlefield
• Warden of the Grove on the battlefield

Steps

1. Activate Bloodthrone Vampire by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters, Warden of the Grove triggers, putting a +1/+1 counter on that creature
4. Resolve the Bloodthrone Vampire ability
5. Repeat

Results

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