Martyr of Containance

{x}, Reveal X white or blue cards from your hand, Sacrifice Martyr of Containance: Tap
up to X target creatures, where X is half the
number of cards revealed this way. They
don't untap during their controllers next
untap step.
"Law is our strength, and it is illegal to defy it."
- Agmand Sarv, Azorius hussar