You control at least one other modified creature with power one or greater.
Steps
Activate Ashnod's Altar by sacrificing any other modified creature you control with power one or greater, adding ({C} magic symbol) ({C} magic symbol) .
One with the Kami triggers, creating a number of 1/1 Spirit creature tokens equal to the sacrificed creature's power.
The Spirit tokens enter the battlefield, triggering Good-Fortune Unicorn that many times, putting a +1/+1 counter on each Spirit token.