Ashnod's Altar + Host of the Hereafter

Ashnod's Altar

Host of the Hereafter

How it works

1. Activate Ashnod's Altar by sacrificing the persist creature that has a +1/+1 counter on it, adding CC.
2. When that creature dies, its persist ability and Host of the Hereafter trigger.
3. Resolve Host of the Hereafter's ability, putting at least two +1/+1 counters onto the surviving persist creature due to the counter-increasing effect.
4. If that creature had a -1/-1 counter on it, remove that and one of the +1/+1 counters from it as a state-based action.
5. Resolve the persist ability from step 2, returning the persist creature from your graveyard to the battlefield with a -1/-1 counter.
6. Repeat.