Blasting Station + Felidar Guardian + Sister Hospitaller

Blasting Station

Felidar Guardian

Sister Hospitaller

How it works

1. Cast Felidar Guardian by paying its mana cost.
2. When Felidar Guardian enters the battlefield, it and Blasting Station trigger.
3. Holding priority, activate Blasting Station by tapping it and sacrificing Felidar Guardian.
4. Resolve the Blasting Station trigger, untapping it.
5. Resolve the Felidar Guardian ability, blinking Sister Hospitaller
6. When Sister Hospitaller enters, it triggers, returning Felidar Guardian from your graveyard to the battlefield and causing you to gain 4 life.
7. Repeat from step 2.