Arzachai, Mana Genius

+2: Until your next turn, up to two target creatures each have base power and toughness 0/3 and lose all abilities.
-7: Untap up to five target lands. They become 5/5 Elemental creatures with trample. They're still lands.
-9: You get an emblem with "At your end step, search your library for a permanent card, put it onto the battlefield, then shuffle your library."