The Master, Formed Anew + Ashnod's Altar

The Master, Formed Anew

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing The Master, adding CC.
2. When The Master dies, if it was a copy of the undying creature, its undying ability triggers, returning it from your graveyard to the battlefield as a copy of the persist creature with a +1/+1 counter on it.
3. Otherwise, if The Master was a copy of the persist creature, its persist ability triggers, returning it from your graveyard to the battlefield as a copy of the undying creature with a -1/-1 counter on it.
4. Repeat.