Felidar Guardian, Vesperlark, and Bloodthrone Vampire

Prerequisites

• Felidar Guardian in hand
• Vesperlark on the battlefield
• Bloodthrone Vampire on the battlefield
• available

Steps

1. Cast Felidar Guardian by paying
2. When Felidar Guardian enters the battlefield, it triggers, targeting Vesperlark
3. Holding priority, activate Bloodthrone Vampire by sacrificing Felidar Guardian
4. Resolve the Felidar Guardian trigger, blinking Vesperlark
5. When Vesperlark leaves the battlefield, it triggers, returning Felidar Guardian from your graveyard to the battlefield
6. Repeat from step 2

Results

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