Antler Skulkin + Solemnity + Genesis Chamber + Phyrexian Altar

Antler Skulkin

Solemnity

Genesis Chamber

Phyrexian Altar

How it works

1. Activate Antler Skulkin by paying 2, giving target white creature you control persist.
2. Activate Phyrexian Altar by sacrificing the persist creature, adding one mana of any color.
3. The creature's persist ability triggers, returning it to the battlefield.
4. Genesis Chamber triggers, creating a 1/1 Myr creature token.
5. Activate Phyrexian Altar by sacrificing the Myr token, adding one mana of any color.
6. Repeat.