Deadpool, Merc with a Mouth

Deadpool, Merc with a Mouth enters the battlefield with a number of +1/+1 counters on
it for each time you've cast a commander this
game.
Regenerate: {1}{b}
You may cast Deadpool, Merc with a Mouth
from your graveyard.
"Time to make the Chimi-f***ing-Changas!"