Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Slurrk, All-Ingesting + Yahenni, Undying Partisan

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

Slurrk, All-Ingesting

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Slurrk.
2. When Slurrk dies, its innate ability and persist ability trigger.
3. Resolve Slurrk's innate ability, putting a +1/+1 counter on each creature you control that already has a +1/+1 counter on it.
4. Resolve Slurrk's persist ability, returning it from your graveyard to the battlefield with four +1/+1 counters on it due to its replacement effect.
5. Resolve the Yahenni ability.
6. Repeat.