Miraak, First Dragonborn

Flash, flying
When Miraak, First Dragonborn enters the
battlefield, gain control of all Dragon creatures.
Then draw a card for each creature you control
that didn't start in your deck.
"He was Dragonborn, yet he served the dragons. A
priest in their order, highly esteemed and very
powerful. Then he turned against them, becoming
something they feared."