Relyna, Apex of Light

+4: Exile up to four target nonland permanents. Your opponents gain life equal to the half the converted mana cost of those permanents rounded down.
-4: If damage has been dealt to an opponent this turn, search your library for four Plains cards, then put them onto the battlefield untapped.
-15: You gain life equal to two times the life totals of your opponents, then create half that many flying Angel tokens with vigilance rounded up.