Agatha's Soul Cauldron + Grumgully, the Generous + Krenko, Mob Boss + Tannuk, Steadfast Second

Agatha's Soul Cauldron

Grumgully, the Generous

Krenko, Mob Boss

Tannuk, Steadfast Second

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.

By feeding Krenko, Mob Boss into Agatha's Soul Cauldron, you give your creatures access to that explosive goblin-making tap ability, while Agatha's Soul Cauldron simultaneously provides the crucial mana-fixing needed to activate it. Meanwhile, Grumgully, the Generous ensures that every newly minted token enters the battlefield with a +1/+1 counter already on it, feeding right back into the Cauldron's requirements to keep the activation loop spinning endlessly. Even though Tannuk, Steadfast Second doesn't directly fuel the loop's loop-de-loops, its passive haste grants your newly spawned horde immediate mobility, and its warp ability offers a sneaky way to slip your key permanents onto the board from exile if the game gets messy.