Activate Kiki-Jiki by tapping it, creating a token copy of Workhorse with haste, that enters the battlefield with four +1/+1 counters.
Activate Workhorse four times by removing four +1/+1 counters from it, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Workhorse dies as a state-based action due to having zero toughness.