Marcus, Ugin's Apprentice

+3: Add a loyalty counter to any other Planeswalker. Shuffle your graveyard and any exiled cards into your library.
-2: Add 4 loyalty counters to any Gideon, Chandra, Jace, Liliana, or Nissa Planeswalker subtypes
-6: Exile all Planeswalkers. Take another turn if you use this ability.