Balerion the Black Dread

Flying, Trample.
Dragonmounting (If you control a creature
with Dragonrider, Balerion gains First Strike.)
Comes into play tapped and doesn't untap
during your untap phase.
When attcking, Balerion deals you 3 dammages
if you don't control a creature with Dragonrider .
{r}{r}{r}{r}: Untap Balerion.