Loki, the Trickster

: Loki, the Trickster can only be targeted by Sorceries and Instants, and can not be attacked.
+1: Target permanent you control becomes another target permanent you control. You can activate this only on your blocking phase.
-2: Loki, the Trickster becomes a copy of another target Planeswalker you control. You can use a ability of that Planeswalker.