Agatha's Soul Cauldron + Grumgully, the Generous + Krenko, Mob Boss + Fires of Yavimaya

Agatha's Soul Cauldron

Grumgully, the Generous

Krenko, Mob Boss

Fires of Yavimaya

How it works

1. Activate a creature with a +1/+1 counter on it, creating a 1/1 red Goblin creature token.
2. The 1/1 Goblin token enters with a +1/+1 counter on it due to Grumgully's ability.
3. Repeat.

This brew turns a standard Goblin horde into an endless marching army by fusing Krenko, Mob Boss's tap ability into the cauldron. With Agatha's Soul Cauldron exiling Krenko and granting its activated ability to your modified creatures, every new token you mint immediately enters the battlefield with a +1/+1 counter thanks to Grumgully, the Generous. That fresh counter instantly arms the newly arrived token with Krenko's tap ability as well, letting you tap and repeat the process to flood the board. Meanwhile, Fires of Yavimaya provides haste so your newly generated mob doesn't have to wait around, allowing you to attack immediately with an infinitely large, hasty horde of Goblins.