Goblin Warrens + Phyrexian Altar + Mondrak, Glory Dominus

Goblin Warrens

Phyrexian Altar

Mondrak, Glory Dominus

How it works

1. Activate Goblin Warrens by paying 2 and sacrificing two Goblins, creating six 1/1 Goblin creature tokens.
2. Activate Phyrexian Altar three times by sacrificing three Goblins, adding 2.
3. Repeat.

This loop transforms a modest sacrifice outlet into a self-sustaining engine by taking advantage of exponential token generation. With Mondrak, Glory Dominus doubling every token created, activating Goblin Warrens by sacrificing two Goblins yields six new tokens instead of three. You can then feed three of those freshly minted tokens directly into Phyrexian Altar to generate the exact red mana needed to pay for Goblin Warrens again, leaving you with extra Goblins and infinite mana to spare.