Underworld Breach + Malevolent Rumble + Cryptolith Rite + Nahiri's Resolve

Underworld Breach

Malevolent Rumble

Cryptolith Rite

Nahiri's Resolve

How it works

1. Cast Malevolent Rumble for its escape cost by paying 1 and exiling three other cards from your graveyard, causing you to mill at least three cards and create a 0/1 Eldrazi Spawn creature token.
2. Activate the Eldrazi Spawn by tapping it, adding .
3. Activate the Eldrazi Spawn by sacrificing it, adding C.
4. Repeat.

This looping engine turns your graveyard into an active workshop by casting Malevolent Rumble over and over through the escape ability granted by Underworld Breach. Each iteration is fueled by the mana from Cryptolith Rite—turning your creatures into sources of any color—and the sacrifice of the Eldrazi Spawn token created during the spell's resolution. While Nahiri's Resolve isn't strictly required for the core mana loop, it pumps your board with a static +1/+0 buff and haste, ensuring your tokens and creatures are immediately ready to tap for mana or fuel future escapes as you mill through your entire library.