Karona, Unstable Avatar

+3: Choose one: Gain 5 life, Scry 3, each opponent discards a card, deal 4 damage to any target, or proliferate.
-4: Choose one: Until end of turn, lands you control produce twice as much mana, or opponents lands don't untap during their next untap step.
-13: Choose one: Exile all artifacts, creatures, enchantments, lands, or other planeswalkers