Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Geralf's Mindcrusher + Umbral Collar Zealot

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

Geralf's Mindcrusher

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Geralf's Mindcrusher
2. When Geralf's Mindcrusher dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Geralf's Mindcrusher enters, it triggers, causing a player to mill five cards.
4. Activate Umbral Collar Zealot by sacrificing Geralf's Mindcrusher
5. When Geralf's Mindcrusher dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
6. When Geralf's Mindcrusher enters, it triggers, causing a player to mill five cards.
7. Resolve both Umbral Collar Zealot abilities from step 1 and 4.
8. Repeat.