Yuna, Eidolon Advocate

: You may look at the top card of your library at any time. You may cast creature spells from the top of your library.
+1: Create a 3/3 green Beast creature token. Put your choice of a vigilance counter, a reach counter, or a trample counter on it.
-2: When you cast your next creature spell this turn, search your library for a creature card with lesser mana value, put it onto the field, shuffle.