If Cryptic Trilobite has any +1/+1 counters, activate Cryptic Trilobite's first activated ability until it has no +1/+1 counters, adding ({C} magic symbol) ({C} magic symbol) that can only be spent to activate abilities each time.
Cryptic Trilobite's undying ability from Mikaeus triggers, returning Cryptic Trilobite from your graveyard to the battlefield with a +1/+1 counter on it.
Repeat.
Results
Infinite colored mana.
Infinite colorless mana that can only be used for activated abilities.