All 16 Combos with Maulfist Squad

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Umbral Collar Zealot + Maulfist Squad

Other: Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, Infinite surveil

Activate Umbral Collar Zealot by sacrificing Maulfist Squad. When Maulfist Squad dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it. When Maulfist Squad enters, its fabricate ability triggers, putting a +1/+1 counter on it. Resolve the Umbral Collar Zealot ability. Repeat.

Cards: Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight