Cryptic Trilobite has at least one +1/+1 counter on it.
({2} magic symbol) available.
Steps
Activate Yawgmoth's second ability by paying ({2} magic symbol) and discarding Voidwing Hybrid, causing you to put a +1/+1 counter on Cryptic Trilobite.
Voidwing Hybrid triggers, returning itself from your graveyard to your hand.
Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding ({2} magic symbol) that can only be spent to activate abilities.