Squarts, Cursed Child

Spectacle {r/w}{b} (You may cast this spell for its
spectacle cost rather than its mana cost if an
opponent lost life this turn.)
Deathtouch, lifelink
When Squarts, Cursed Child enters the battlefield, Squarts, Cursed Child deals 1 damage
to each opponent for each time you've cast your commander from the command zone this game.