Lagrella, the Magpie + Sun Titan + Yahenni, Undying Partisan

Lagrella, the Magpie

Sun Titan

Yahenni, Undying Partisan

How it works

1. Cast Lagrella by paying
2. When Lagrella enters the battlefield, it triggers, exiling Sun Titan until Lagrella leaves the battlefield.
3. Activate Yahenni by sacrificing Lagrella.
4. When Lagrella leaves the battlefield, Sun Titan is returned to the battlefield from exile.
5. When Sun Titan enters the battlefield, it and Lagrella triggers.
6. Resolve the Lagrella trigger, putting two +1/+1 counters on Sun Titan.
7. Resolve the Sun Titan trigger, returning Lagrella from your graveyard to the battlefield.
8. Repeat from step 2.
9. Resolve all Yahenni abilities.