magic the gathering ravnica city of guilds booster box Magic: Bundle | 10 Packs + Land Cards (230 Cards) available in standard and foil versions Ravnica: City of Guilds Booster

-11: Search your library for any number of colorless nonland cards, exile them, then shuffle

Sure, you could build a deck to discard your own cards, but honestly, making your opponent discard is far more fun

Credit: Wizards of the Coast Synth Eradicator Steel Mentor: As mentioned in Nick Valentine's entry above, Synths are advanced androids developed by The Institute, the descendants of MIT scientists who holed up underground and have been playing around with advanced tech as the survivors on the surface fought tooth and nail to survive

While the real card version doesnt quite do this, its still pretty powerful

national championships