Mimiror, the Corrupted

+1: Until end of turn, Mimiror becomes a 2/2 Horror creature with flying, hexproof, and haste.
+1: Until end of turn, Mimiror becomes a copy of target creature.
-8: Mimiror becomes an 8/8 colorless Eldrazi Horror creature with annihilator 2. (This effect lasts indefinitely.)