Arcbound Reclaimer + Mystic Forge + Arcbound Worker + Ashnod's Altar

Arcbound Reclaimer

Mystic Forge

Arcbound Worker

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Arcbound Worker, adding CC.
2. Arcbound Worker dies, triggering its modular ability, moving its +1/+1 counters onto Arcbound Reclaimer.
3. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Arcbound Worker on top of your library from your graveyard.
4. Cast Arcbound Worker from the top of your library by paying 1.
5. Arcbound Worker enters the battlefield with a +1/+1 counter on it due to its modular ability.
6. Repeat.