Sun Titan + Blasting Station + Unholy Indenture

Sun Titan

Blasting Station

Unholy Indenture

How it works

1. Activate Blasting Station by tapping it and sacrificing Sun Titan.
2. When Sun Titan dies, Unholy Indenture triggers, returning Sun Titan from your graveyard to the battlefield.
3. When Sun Titan enters, it and Blasting Station trigger.
4. Resolve the Sun Titan trigger, returning Unholy Indenture from your graveyard to the battlefield attached to Sun Titan.
5. Resolve the Blasting Station trigger, untapping it.
6. Resolve the Blasting Station ability from step 1.
7. Repeat.