Underworld Breach + Malevolent Rumble + Fervor + Elven Chorus

Underworld Breach

Malevolent Rumble

Fervor

Elven Chorus

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.

By leveraging Underworld Breach, every nonland card in your graveyard gains escape, allowing you to recast Malevolent Rumble over and over by feeding it fuel from your own yard. Elven Chorus ensures your battlefield is primed by turning your creatures into mana sources, giving you the colors you need alongside the Eldrazi Spawn tokens that Malevolent Rumble creates. Meanwhile, Fervor grants those tokens haste, allowing them to tap for mana immediately through Elven Chorus before you sacrifice them to repeat the entire loop.