Metamorphosis Fanatic + Ashnod's Altar + Felidar Guardian

Metamorphosis Fanatic

Ashnod's Altar

Felidar Guardian

How it works

1. Cast Felidar Guardian by paying its mana cost.
2. When Felidar Guardian enters the battlefield, it triggers, targeting Metamorphosis Fanatic.
3. Holding priority, activate Ashnod's Altar by sacrificing Felidar Guardian.
4. Resolve the Felidar Guardian ability, blinking Metamorphosis Fanatic.
5. When Metamorphosis Fanatic enters the battlefield, it triggers, returning Felidar Guardian from your graveyard to the battlefield.
6. Repeat from step 2.