Roalesk enters the battlefield, putting two +1/+1 counters on Crystalline Crawler.
Activate Cryptic Trilobite's first ability twice by removing two +1/+1 counters from it, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) that can only be spent to activate abilities.
Repeat.
Once you have infinite ({C} magic symbol) , you may target other creatures with Roalesk's trigger.
Results
Infinite +1/+1 counters.
Infinite colorless mana that can only be spent to activate abilities.