Felidar Guardian + Vesperlark + Spawning Pit

Felidar Guardian

Vesperlark

Spawning Pit

How it works

1. Cast Felidar Guardian by paying 3.
2. When Felidar Guardian enters the battlefield, it triggers, targeting Vesperlark.
3. Holding priority, activate Spawning Pit 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.