Myr Propagator + Krark-Clan Ironworks + Lightning Greaves + Parallel Lives

Myr Propagator

Krark-Clan Ironworks

Lightning Greaves

Parallel Lives

How it works

1. Activate Lightning Greaves' equip ability by paying 0, attaching it to Myr Propagator.
2. Activate Myr Propagator by paying 3 and tapping it, creating two token copies of itself.
3. Activate Krark-Clan Ironworks twice by sacrificing the tapped Myr Propagator and a Myr Propagator token, adding CCCC.
4. Repeat.
5. Once you have infinite mana, you may forego sacrificing the Myr Propagator tokens.

This elegant loop turns a modest mechanical duplicate into an unstoppable automated foundry by leveraging Parallel Lives to double every token Myr Propagator creates from a single activation. With Lightning Greaves keeping the original protected with shroud while costing nothing to move around, you can continually tap and sacrifice your growing metallic swarm to Krark-Clan Ironworks. Because the Ironworks generously refunds you more colorless mana than the Propagator demands to activate, you quickly scale into infinite mana, infinite tokens, and an overwhelming mechanical advantage.