Infinite colored manaInfinite +1/+1 counters on certain creatures
How it works
Activate Bristly Bill by paying 5, doubling the number of +1/+1 counters on creatures you control.
Activate Crystalline Crawler three times by removing three +1/+1 counters from it, adding six C that can only be spent to activate abilities.
Repeat.
Activate Bristly Bill by paying 3, doubling the number of +1/+1 counters on each creature you control.
Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding 3.
Repeat.
If Crystalline Crawler has six or more +1/+1 counters on it to start the combo, this combo results in infinite colored mana.
This ingenious loop turns simple counter-manipulation into boundless magical energy by turning Crystalline Crawler into a self-recharging battery. With Chromatic Orrery smoothing your mana and letting you spend those colorless charges as though they were any color, you have the ultimate color-fixing engine to satisfy strict activation costs. Meanwhile, Bristly Bill, Spine Sower acts as the ultimate amplifier, periodically doubling your counter reserves so that stripping them away for mana yields far more than you put in.