Mikaeus, the Unhallowed + Yahenni, Undying Partisan + Grazing Kelpie

Mikaeus, the Unhallowed

Yahenni, Undying Partisan

Grazing Kelpie

How it works

1. Activate Yahenni by sacrificing Grazing Kelpie.
2. When Grazing Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Resolve the Yahenni ability.
4. Activate Yahenni by sacrificing Grazing Kelpie.
5. When Grazing Kelpie dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Resolve the Yahenni ability.
7. Repeat.