Aiela, Dragon Sword

{x}{g}{w}: Monstrosity X (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)
As long as Aiela, Dragon Sword is monstrous, it
has flying.
When Aiela, Dragon Sword becomes monstrous, search your library for X basic land cards and put
them onto the battlefield tapped. Then shuffle
your library.