({4} magic symbol) minus ({1} magic symbol) for each +1/+1 counter on
Workhorse available.
Steps
Activate
Workhorse by removing a +1/+1 counter from it, adding ({C} magic symbol) .
Repeat step 1 until
Workhorse dies as a state-based action due to having 0 toughness.
Activate
Soldevi Digger by paying ({2} magic symbol) , putting
Workhorse from your graveyard onto the bottom of your library.
Activate
Grenzo by paying ({2} magic symbol) , putting
Workhorse from the bottom of your library into your graveyard, and then putting it onto the battlefield with four +1/+1 counters on it due to its static effect.