Beholder

Flying
{1}{w}: Tap target creature.
{1}{u}: Gain control of target creature until end of
turn.
{1}{b}: Target creature gets -2/-2 until end of turn.
{1}{r}: Beholder deals 2 damage to each opponent.
{1}{g}: Destroy target artifact.
Beholder's abilities can only be activated once per
turn, and only any time you could cast a
sorcery.