Butcher Ghoul does not have a +1/+1 counter on it.
({1} magic symbol) available.
Steps
Activate Ghave's second ability by paying ({1} magic symbol) and sacrificing Butcher Ghoul.
Blood Artist and Butcher Ghoul's undying ability trigger.
Resove the Blood Artist trigger, causing a player to lose 1 life and causing you to gain 1 life.
Resolve Butcher Ghoul's undying ability, returning Butcher Ghoul from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Ghave ability, putting a +1/+1 counter on Cryptic Trilobite.
Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding ({C} magic symbol) ({C} magic symbol) that can only be spent to activate abilities.
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from Butcher Ghoul, creating a 1/1 Saproling creature token.
Repeat.
Results
Infinite +1/+1 counters on creatures you control.
Infinite colorless mana that can only be spent to activated abilities.