Alduin, World Eater

Flying, Deathtouch
When Alduin, the World Eater enters the battlefield or deals combat damage, reanimate a
Dragon from your graveyard
Other Dragons you control gain +2/+2
"When the Dragonborn ruler loses his throne, and the
White Tower falls When the Snow Tower lies sundered, kingless, bleeding The World-Eater wakes, and the
Wheel turns upon the Last Dragonborn".
~Dragonborn Prophecy