Rigel, The Unknowable

+1: Tap two permanents you don't control. They don't untap during their owners' next untap phase.
-3: Scry 2, then reveal the top two cards of your library. Each opponent loses life equal to their converted mana cost and you gain that much life.
-10: At the beginning of target opponent's next upkeep, they lose half their life, rounded down, unless they skip their turn.