Staffenar, Arcana Obsidia

: Staffenar, Arcana Obsidia is an artifact planeswalker.
+2: Reveal the top card of your library. If it's an artifact card, you may cast it with mana cost reduced by 1.
-11: Create five 4/4 Obsidia Dragon artifact creature tokens with flying and "If this creature becomes the target of a spell, you may sacrifice it."