Formshifting Bat

Flying
When Formshifting Bat enters the battlefield,
create a 1/1 black Bat creature token with flying.
Vampire creature cards in your hand have
Formshift from Bat X, where X is its mana cost
reduced by {3}. (X, return an unblocked
attacking Bat creature you control to its owner's
hand: Put this card onto the battlefield from
your hand tapped and attacking.)