Wernog, Rider's Chaplain + Metamorphosis + Underworld Breach + Academy Manufactor + Grinding Station

Wernog, Rider's Chaplain

Metamorphosis

Underworld Breach

Academy Manufactor

Grinding Station

How it works

1. Cast Wernog either from your hand, graveyard or from the command zone by paying plus commander tax or exiling three cards from your graveyard, if necessary.
2. When Wernog enters, it triggers, causing you to create at least one Food, one Clue and one Treasure.
3. When the artifact tokens enter, Grinding Station trigger that many times.
4. Resolve a Grinding Station trigger, untapping it.
5. Holding priority, activate Grinding Station by sacrificing a Clue or Food, causing you to mill three cards.
6. Repeat from step 4 one additional time. Then, resolve any remaining Grinding Station triggers, untapping it.
7. Activate a Treasure by tapping and sacrificing it, adding .
8. Cast Metamorphosis either from your hand or from your graveyard for its escape cost by paying and exiling three cards from your graveyard, if necessary, and sacrificing Wernog.
9. When Wernog dies, it triggers, causing you to create at least one Food, one Clue and one Treasure.
10. Repeat steps 3 through 6 once.
11. Resolve Metamorphosis, adding or that can only be spent to cast creature spells.
12. Activate a Treasure by tapping and sacrificing it, adding W/B.
13. Repeat from step 1.

This loop relies on the brilliant alchemy of Academy Manufactor to turn Wernog, Rider's Chaplain entering and leaving the battlefield into a cascade of Clue, Food, and Treasure tokens. Every time these artifacts arrive, Grinding Station untaps to fuel our graveyard while sacrificing our newly minted tokens, which neatly triggers Wernog's leaving-the-battlefield ability when we feed it to Metamorphosis. By spending the mana from Metamorphosis and cracking a Treasure, we can recast Wernog and replay Metamorphosis over and over again from our graveyard using Underworld Breach's escape ability.