Requires

Myr Propagator must be on the battlefield. Krark-Clan Ironworks must be on the battlefield. Lightning Greaves must be on the battlefield. Primal Vigor must be on the battlefield. Mana needed:

Steps

1. Activate Lightning Greaves' equip ability by paying , attaching it to Myr Propagator.
2. Activate Myr Propagator by paying 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 .
4. Repeat.
5. Once you have infinite mana, you may forego sacrificing the Myr Propagator tokens.

Results