Mite Overseer + Ashnod's Altar + Stridehangar Automaton + Dazzling Angel

Mite Overseer

Ashnod's Altar

Stridehangar Automaton

Dazzling Angel

How it works

1. Activate Mite Overseer by paying 3W/P, creating two creature tokens.
2. When the creature tokens enter the battlefield, Dazzling Angel triggers twice, causing you to gain 2 life.
3. Activate Ashnod's Altar twice by sacrificing the creature tokens, adding CCCC.
4. Repeat.

This loop relies on Stridehangar Automaton's replacement effect to turn a single token creation event into two tokens instead of one, fueling Mite Overseer's ability and generating a net profit of colorless mana when sacrificed to Ashnod's Altar. Because Dazzling Angel triggers twice for every iteration as these tokens enter the battlefield, you can cycle through the loop endlessly to harvest infinite colorless mana, infinite creature tokens, and infinite lifegain.