Lagrella, the Magpie + Sun Titan + Preston, the Vanisher + Cloudshift

Lagrella, the Magpie

Sun Titan

Preston, the Vanisher

Cloudshift

How it works

1. Cast Cloudshift by paying , blinking Lagrella.
2. When Lagrella enters the battlefield, it and Preston triggers.
3. Resolve the Lagrella trigger, exiling Sun Titan until Lagrella leaves the battlefield.
4. Resolve the Preston trigger, creating a token copy of Lagrella that is a 0/1 Illusion.
5. Put the nontoken Lagrella into your graveyard due to the legend rule.
6. If Lagrella is your commander, choose not to return it to the command zone from your graveyard.
7. When Lagrella leaves the battlefield, Sun Titan is returned to the battlefield from exile.
8. Sun Titan, Lagrella and Preston each trigger.
9. Resolve the Preston trigger, creating a token copy of Sun Titan that is a 0/1 Illusion.
10. When the Sun Titan token enters the battlefield, it triggers, choosing to return nothing to the battlefield.
11. Resolve the Lagrella trigger, putting two +1/+1 counters on the nontoken Sun Titan.
12. Resolve the Sun Titan trigger from step 8, returning Lagrella from your graveyard to the battlefield.
13. Repeat from step 2.

This clever loop turns Lagrella, the Magpie into a revolving door of triggers, with Cloudshift providing the initial spark to get the engine running. Preston, the Vanisher acts as your token factory, multiplying your legendary Magpies into fragile 0/1 illusions while slipping around the legend rule to keep the cycle going. Meanwhile, Sun Titan anchors the loop by digging Lagrella right back out of your graveyard the moment it's returned to the battlefield, endlessly fueling the chain for infinite enters-the-battlefield triggers, death triggers, and token copies.