Cryptic Trilobite has at least three +1/+1 counters.
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 a 1/1 Saproling creature token.
The Saproling enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
Activate Ghave's second ability by paying ({1} magic symbol) and sacrificing the Saproling token, putting a +1/+1 counter on Cryptic Trilobite.
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 any creature you control, creating a 1/1 Saproling creature token.
Repeat from step 3.
Once you have infinite +1/+1 counters on Cryptic Trilobite, you may activate Ghave's first ability an infinite number of times to get infinite Saproling tokens.