Cryptic Trilobite has 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.
Venser triggers, creating a legendary 3/3 The Hollow Sentinel artifact creature token.
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.
Activate Phyrexian Altar by sacrificing The Hollow Sentinel, adding ({U} magic symbol) .
Repeat.
Results
Infinite +1/+1 counters on Cryptic Trilobite.
Infinite colorless mana that can only be spent to activate abilities.