Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Reputable Merchant + Yahenni, Undying Partisan

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

Reputable Merchant

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Reputable Merchant.
2. When Reputable Merchant dies, its innate ability and persist ability trigger.
3. Resolve the Reputable Merchant trigger, putting a +1/+1 counter on a creature you control.
4. Resolve the persist trigger, returning Reputable Merchant from your graveyard to the battlefield with a -1/-1 counter on it.
5. When Reputable Merchant enters, it triggers, putting a +1/+1 counter on it.
6. Resolve the Yahenni ability.
7. Repeat.