Smaug, Erebor's Ire

Flying, trample, haste, menace
When Smaug enters the battlefield, gain control
of all artifacts. They lose all abilities and gain
"{t}, Sacrifice this artifact: Add {r}. Target
creature gets +1+1 until end of turn."
Whenever a creature enters the battlefield under
an opponent's control, Smaug deals 1 damage to
that creature and 1 damage to that creature's controller.