Myr Propagator + Ashnod's Altar + Lightning Greaves + Anointed Procession

Myr Propagator

Ashnod's Altar

Lightning Greaves

Anointed Procession

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 looping machine relies on Myr Propagator as its cloning engine, which gets equipped with Lightning Greaves so it can tap immediately without waiting for summoning sickness. When you activate the Myr, Ashnod's Altar steps in to sacrifice the original and one of the newly minted copies for four colorless mana, easily paying back the activation cost while feeding the loop. Meanwhile, Anointed Procession quietly doubles every token creation event from a single copy into a pair, turning a standard reproduction into a net gain of bodies and mana that quickly spirals out of control.