You control a creature with a +1/+1 counter on it.
({2} magic symbol) available.
Steps
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from a creature you control, creating a 1/1 Saproling creature token.
The Saproling creature token enters the battlefield, triggering Good-Fortune Unicorn, putting a +1/+1 counter on the Saproling token.
Activate Ghave's first ability by paying ({1} magic symbol) and removing a +1/+1 counter from a Saproling, creating another 1/1 Saproling creature token.
The Saproling creature token enters the battlefield, triggering Good-Fortune Unicorn, putting a +1/+1 counter on the Saproling token.
Activate Ashnod's Altar by sacrificing a Saproling token without a +1/+1 counter, adding ({C} magic symbol) ({C} magic symbol) .