Vhagar

Dragonrider—Laena Velaryon, Aemond Targaryen
Flying, Burn 3, Trample
Aegon's Conquest—Whenever Vhagar deals combat
damage to an opponent, reveal the top five cards of
that players library. You may put a non-creature permanent from among them onto the battlefield.
Put the rest into that player's graveyard.
"Vhagar grows old, but her fires still burn hot."
—Visenya Targaryen