Future Avenger

When Future Avenger is cast, reveal cards
from the top of your library until you reveal a
creature card. You may cast that card for half of
its converted mana cost, rounded down, and
place Future Avenger on it. This creature gains
+1/+1 and counts as an Avenger.
If you choose not to cast the revealed creature
this turn, put it in your hand and reshuffle your
library.