Liadain, Mind Borrower

+2: Scry 2 and tap a creature each opponent controls. Those creatures don't untap during their owner's upkeep.
0: Choose the Loyalty Ability of another Planeswalker. Liadain uses that Ability this turn if Liadain has enough Loyalty counters.
-8: Gain control of a target creature each opponent controls, then repeats this process for an artifact, an enchantment, planeswalker, and a land.