Emry, Lurker of the Loch + Mirran Spy + Rusted Slasher + Mana Crypt

Emry, Lurker of the Loch

Mirran Spy

Rusted Slasher

Mana Crypt

How it works

1. Activate Mana Crypt by tapping it, adding CC.
2. Activate Rusted Slasher by sacrificing Mana Crypt, regenerating Rusted Slasher.
3. Activate Emry by tapping it, allowing yourself to cast Mana Crypt from your graveyard this turn.
4. Cast Mana Crypt from your graveyard by paying 0.
5. When you cast Mana Crypt, Mirran Spy triggers, untapping Emry.
6. Mana Crypt resolves.
7. Repeat any number of times.
8. Once you have infinite colorless mana, you may repeat the loop targeting any castable artifact card in your graveyard in step 3 each time.
9. You may also skip step 2 to leave your artifacts on the battlefield, or you may sacrifice Rusted Slasher in step 2 and recast it in step 4 for infinite ETB, LTB, sacrifice, and death triggers.