Pareto Magistrate

{0}: Reveal a card from your hand. Then, if that card is strictly worse than target permanent or spell, exile that permanent or spell. Activate this only once per turn.(A card is strictly worse if, all else held constant (such as color and types), either the revealed card costs same/more but produces less/same effect, respectively. For example, a Lightning Bolt is cast and you reveal a Shock, counter the Lightning Bolt. Ignore corner cases