Tenzin, Knave Maestro

+3: Scry 3, then reveal the card with the lowest converted mana cost, each opponent sacrifices a creature with converted mana cost equal to that card
-2: Tap up to two target creatures, they don't untap during the next untap step, draw a card.
-12: Put two -1/-1 counter on all creatures target opponent controls and you get an emblem with "Creatures with a -1/-1 counter on them cannot attack"