Spawning Pit + Wormfang Drake + Sun Titan

Spawning Pit

Wormfang Drake

Sun Titan

How it works

1. Cast Wormfang Drake by paying its mana cost.
2. When Wormfang Drake enters, its first ability triggers, exiling Sun Titan.
3. Activate Spawning Pit by sacrificing Wormfang Drake.
4. When Wormfang Drake dies, its second ability triggers, returning Sun Titan from exile to the battlefield.
5. When Sun Titan enters, it triggers, returning Wormfang Drake from your graveyard to the battlefield.
6. When Wormfang Drake enters, its first ability triggers, exiling Sun Titan.
7. Resolve the Spawning Pit ability.
8. Repeat from step 3.