Stunted Drake

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Stunted Drake enters the battlefield, if its
stalk cost was paid, it gains flying.
Stalk {2}{u} (At the end of each block step, if there is
an unblocked creature attacking you, you may cast
this card for its stalk cost. If you do, choose an
unblocked creature attacking you. This creature blocks
that creature.)