Underworld Breach + Malevolent Rumble + Garna, the Bloodflame + Insidious Roots

Underworld Breach

Malevolent Rumble

Garna, the Bloodflame

Insidious Roots

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 loop is a masterclass in resource recycling, anchored by Underworld Breach which grants every nonland card in your graveyard the escape keyword so you can cast your spells over and over again. You kick things off by casting Malevolent Rumble from your graveyard, using its effects to dig through your library, fill your graveyard with fuel, and churn out an Eldrazi Spawn token. Meanwhile, Insidious Roots watches the graveyard like a hawk; every time your escape costs exile cards or creatures leave the yard, it rewards you with a Plant token and growing +1/+1 counters, while your Eldrazi Spawn tap for mana to help pay the way. To keep the engine running indefinitely, Garna, the Bloodflame steps in with her entry trigger to scoop every creature card that hit your graveyard this turn right back into your hand, ensuring you never run out of ammo as you churn through your deck.