The Skull Knight

+2: Draw a card, then discard a card. If you discard an artifact deal 2 damage to target opponent and gain 2 life.
0: Until end of turn, The Skull Knight becomes a 5/5 Skeleton Warrior creature with indestructible and deathtouch that's still a Planeswalker.
-10: Destroy all creatures, then return target creature card from your graveyard to the battlefield. It gains haste.