Felidar Guardian + Valkyrie's Call + Conspiracy + Blasting Station

Felidar Guardian

Valkyrie's Call

Conspiracy

Blasting Station

How it works

1. Activate Blasting Station by tapping it and sacrificing Felidar Guardian.
2. When Felidar Guardian dies, Valkyrie's Call triggers, returning Felidar Guardian from your graveyard to the battlefield as an Angel.
3. When Felidar Guardian enters the battlefield, it and Blasting Station trigger.
4. Resolve the Felidar Guardian trigger, blinking Conspiracy. Choose any creature type except "Angel" as Conspiracy enters the battlefield.
5. Resolve the Blasting Station trigger, untapping it.
6. Resolve the Blasting Station ability from step 1.
7. Repeat.