Corby, Bard?

{1}{w}: Add +1/+1 to target creature until end of
turn.
{1}{b}: Add -1/0 to target creature until end of
turn.
{2}{b}{w}: Corby, Bard? cannot be blocked this
turn.
{x}{b}{w}: Sacrifice Corby, Bard?. Deal X damage
to target creature or player, where X is the
number of times someone has tapped, hummed,
or broken into song this game.