Grosk, Arbiter of Worth

+1: Grosk becomes a 4/4 Avatar creature with indestructible, wither and defender until the beginning of your next turn, prevent all loyalty damage.
0: Grosk becomes a 4/4 Avatar creature with indestructible and wither until the end of the turn, prevent all loyalty damage.
-8: Exile all creatures, you may put up to two of those creatures onto the battlefield under your control.