Mikaeus, the Unhallowed + Hex Parasite + Ashnod's Altar + Bog Initiate

Mikaeus, the Unhallowed

Hex Parasite

Ashnod's Altar

Bog Initiate

How it works

1. Activate Ashnod's Altar by sacrificing Hex Parasite, adding CC.
2. Hex Parasite dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Activate Bog Initiate by paying 1, adding .
4. Activate Hex Parasite by paying 1, removing the +1/+1 counter from it and giving it +1/+0 until end of turn.
5. Repeat.