Cryptic Trilobite and Crystalline Crawler each have at least one +1/+1 counter on it.
({3} magic symbol) ({U} magic symbol) available.
Steps
Activate Viral Drake by paying ({3} magic symbol) ({U} magic symbol) , putting two +1/+1 counters on Cryptic Trilobite and Crystalline Crawler.
Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding ({U} magic symbol) .
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.
Results
Infinite +1/+1 counters on Cryptic Trilobite and Crystalline Crawler.
Infinite colored mana.
Infinite colorless mana that can only be spent to activate abilities.