Sidisi, Regent of the Mire + Bladewing the Risen + Thornbite Staff + Spawning Pit

Sidisi, Regent of the Mire

Bladewing the Risen

Thornbite Staff

Spawning Pit

How it works

1. Activate Sidisi by tapping it and sacrificing a nontoken Dragon with mana value 6.
2. When the creature dies, Sidisi triggers, untapping Sidisi.
3. Resolve the Sidisi ability, returning Bladewing from your graveyard to the battlefield.
4. When Bladewing enters the battlefield, it triggers, returning the Dragon with mana value 6 from your graveyard to the battlefield.
5. Activate Spawning Pit by sacrificing Bladewing.
6. When Bladewing dies, Sidisi triggers, untapping Sidisi.
7. Resolve the Spawning Pit ability.
8. Repeat.