Zhaeldron, Dragon God

flying, hexproof, trample
player must pay 5 life to play Zhaeldron, Dragon God
{10} all land of the opponent is destroyed, (but lose flying, hexproof, trample)
When Zhaeldron enters the battlefield all dragons fall under the players control and remain under their control till Zhaeldron leaves the field.
"the god of dragons, born from the stars and truly masterless."