Long Feng, Grand Secretariat + Krark-Clan Ironworks + Pentavus

Long Feng, Grand Secretariat

Krark-Clan Ironworks

Pentavus

How it works

1. Activate Pentavus by paying 1 and removing a +1/+1 counter from it, creating a creature token.
2. Activate Krark-Clan Ironworks by sacrificing the creature token, adding CC.
3. When the creature token dies, Lord Feng triggers, putting a +1/+1 counter on Pentavus.
4. Repeat.

This engine turns Pentavus and Krark-Clan Ironworks into a self-sustaining mana factory, fueled by the artifact creature tokens you create and sacrifice. Because Krark-Clan Ironworks rewards you with two colorless mana for every token you feed to it, you can easily pay the activation costs to rebuild and recycle your resources indefinitely. The real linchpin that makes this loop net both mana and counters is Long Feng, Grand Secretariat, whose triggered ability exploits the constant stream of deaths by placing a +1/+1 counter back onto Pentavus every time a token hits the graveyard.