Cryptic Trillobite has at least two +1/+1 counters on it.
({1} magic symbol) available.
Steps
Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding ({C} magic symbol) ({C} magic symbol) .
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from Cryptic Trilobite, creating two 1/1 Saproling creature tokens.
Activate Ghave's second ability by paying ({1} magic symbol) and sacrificing a Saproling, putting two +1/+1 counters on Cryptic Trilobite.
Repeat.
Once you have infinite +1/+1 counters on Cryptic Trilobite, you may alter this loop to produce infinite creature tokens, put infinite +1/+1 counters on all your creatures, and activate Cryptic Trilobite infinite times.
Results
Infinite +1/+1 counters on creatures you control.
Infinite colorless mana that can only be spent to activate abilities.