Underworld Breach + Malevolent Rumble + Fervor + Enduring Vitality

Underworld Breach

Malevolent Rumble

Fervor

Enduring Vitality

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 again by continually exiling three cards from your graveyard to fuel the cycle. While Malevolent Rumble fills your graveyard and spawns Eldrazi tokens, Fervor ensures those tokens have haste so they don't have to wait around to be used. Meanwhile, Enduring Vitality transforms every creature you control into a mana producer with its static ability, letting you tap your tokens for colored mana while also supplying the colorless mana needed from sacrificing them.