Grenzo, Dungeon Warden + Soldevi Digger + Su-Chi Cave Guard + Goblin Bombardment

Grenzo, Dungeon Warden

Soldevi Digger

Su-Chi Cave Guard

Goblin Bombardment

How it works

1. Activate Goblin Bombardment by sacrificing Su-Chi Cave Guard.
2. When Su-Chi Cave Guard dies, it triggers, adding eight C.
3. Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
4. Activate Soldevi Digger by paying 2, putting Su-Chi Cave Guard on the bottom of your library from your graveyard.
5. Activate Grenzo by paying 2, putting Su-Chi Cave Guard into your graveyard from the bottom of your library, and then putting it onto the battlefield.
6. Repeat.

This clever loop relies on Goblin Bombardment to sacrifice Su-Chi Cave Guard, which immediately triggers its death ability to yield a massive burst of eight colorless mana. With that mana fueling the engine, you use Soldevi Digger to tuck the fallen automaton back onto the bottom of your library, allowing Grenzo, Dungeon Warden's ability to reach down and pull it right back onto the battlefield. Because Grenzo enters with enough +1/+1 counters to ensure Su-Chi Cave Guard's power meets the condition, the loop becomes self-sustaining and generates an infinite surplus of colorless mana and damage.