Alduin, Bane of Kings

Vigilance, Flying, Protection from all colors.
Eminence-Whenever Alduin is in the command zone or on the battlefield cast as many dragons in your hand onto the battlefield and give it +3/+3 counters with menace.
And the Scrolls have foretold, of black wings in the cold, that when brothers wage war come unfurled! Alduin, bane of kings ancient shadow unbound, with a hunger to swallow the world!- Song of the Dragonborn