Feldon of the Third Path + Worldgorger Dragon + Concordant Crossroads + Adric, Mathematical Genius

Feldon of the Third Path

Worldgorger Dragon

Concordant Crossroads

Adric, Mathematical Genius

How it works

1. Activate any number of permanents by tapping them, adding at least 4.
2. Activate Feldon by paying 2 and tapping it, targeting Worldgorger Dragon.
3. Activate Adric by paying 2 and tapping it, copying Feldon's ability targeting Worldgorger Dragon.
4. Resolve the copy of Feldon's ability, creating a token copy of Worldgorger Dragon.
5. When the Worldgorger Dragon token enters, its first ability triggers, exiling all other permanents you control.
6. Resolve the Feldon ability from step 2, creating a token copy of Worldgorger Dragon.
7. When the Worldgorger Dragon token enters, its first ability triggers, exiling all other permanents you control.
8. When the Worldgorger Dragon token created in step 4 leaves the battlefield, its second ability triggers, returning all cards exiled with it to the battlefield.
9. Repeat.

By using Adric, Mathematical Genius to copy Feldon of the Third Path's activation, you double up on bringing Worldgorger Dragon back from the graveyard as an artifact token. Every time a Worldgorger Dragon token enters the battlefield, its triggered ability exiles your entire board—including your lands, Feldon of the Third Path, Adric, Mathematical Genius, and Concordant Crossroads—which immediately causes that same token to leave the battlefield and return everything untapped. Concordant Crossroads ensures your mana-producing permanents are ready to be tapped the instant they return, fueling the loop infinitely and letting you generate boundless mana, landfalls, and enter-the-battlefield triggers.