Lazav the Vengeful

+3: Draw two cards. Target opponent loses 2 life. Destroy up to one target planeswalker.
-3: Each opponent discards a card. You draw that many cards. Each player loses that much life. Destroy up to one target planeswalker.
-12: Destroy all planeswalkers. Return all permanents to their owners' hands. Each player's life becomes their starting life minus their current life.