Brainstealer Dragon

Flying
When Brainstealer Dragon enters the battlefield,
scry {x} from target library, where {x} is the amount of mana paid to summon
Brainstealer Dragon. Tap target number of creatures
Equal to the number of cards moved to the bottom of target library by scry.
At the beginning of your next end step, target creatures are
placed under the control of the owner of Brainstealer Dragon.