Ghave, Guru of Spores + Cryptic Trilobite + Good-Fortune Unicorn

Prerequisites

Cryptic Trilobite has at least four +1/+1 counters.

Steps

1. Activate Cryptic Trilobite's first ability by removing two +1/+1 counters from it, adding {C}{C}{C}{C}.
2. Activate Ghave's first ability by paying {1} and removing a +1/+1 counter from Cryptic Trilobite, creating a 1/1 Saproling creature token.
3. The Saproling enters the battlefield, triggering Good-Fortune Unicorn, putting a +1/+1 counter on the Saproling.
4. Activate Ghave's first ability by paying {1} and removing a +1/+1 counter from a Saproling, creating a 1/1 Saproling creature token.
5. The Saproling enters the battlefield, triggering Good-Fortune Unicorn, putting a +1/+1 counter on the Saproling.
6. Activate Ghave's second ability by paying {1} and sacrificing a Saproling token with no counters on it, putting a +1/+1 counter on Cryptic Trilobite.
7. Activate Cryptic Trilobite's first ability by removing a +1/+1 counter from it, adding {C}{C}.
8. Repeat from step 4.