Mikaeus, the Unhallowed, Bloodthrone Vampire, and Dream Seizer

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Bloodthrone Vampire on the battlefield
• Dream Seizer on the battlefield

Steps

1. Activate Bloodthrone Vampire by sacrificing Dream Seizer
2. When Dream Seizer dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
3. When Dream Seizer enters the battlefield, it triggers, putting a -1/-1 counter on it
4. Resolve the Bloodthrone Vampire ability Repeat

Results

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