Boaz, Frog Smoocher

When Boaz, Frog Smoocher enters the battlefield, each player mills twenty cards.
If it was cast from your command zone,
each player mills thirty cards instead.
{x}{u}{b}{g}, exile X cards from your graveyard: target player mills X cards.
{x}{u}{b}{g}, mill X cards: exile X cards from target player's graveyard.