Mondrak, Glory Dominus + Myr Propagator + Ashnod's Altar + Lightning Greaves

Mondrak, Glory Dominus

Myr Propagator

Ashnod's Altar

Lightning Greaves

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 Ashnod's Altar 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 clever engine exploits the exponential scaling of token doublers to spin a single Myr Propagator out of control. By outfitting the Propagator with Lightning Greaves, it gains the protection and speed it needs to start churning out copies immediately, while Mondrak, Glory Dominus quietly steps in to double every single token creation into a pair. We then feed those newly minted duplicates straight into Ashnod's Altar, sacrificing them to generate more than enough colorless mana to cover the Propagator's activation cost with plenty left over to fuel an unstoppable loop.