You may discard up to 3 Energy cards from your hand
Over in Pauper, things are similarly exciting
Additionally, they let you have an early-game Pokemon to start the game with and take damage without decreasing the consistency of your Pokeballs targeting your combo pieces
Avishkar Raceway Awaken the Honored Dead Azula, On the Hunt Bagel and Schmear Bahamut, Warden of Light Balamb Garden, Airborne Bandit's Haul Bandit's Talent Barbed Servitor Baron Bertram Graywater Baron Strucker, HYDRA Overlord Basri, Tomorrow's Champion Baxter Building Beast, Erudite Aerialist Beastbond Outcaster Beetle-Headed Merchants Bellowing Crier Benthic Criminologists Betor, Kin to All Bewildering Blizzard Beza, the Bounding Spring Biomechan Engineer Biorganic Carapace Bitter Chill Black Panther, Hope Enduring Blighted Blackthorn Blitzball Boiling Rock Prison Bold Biochemist Bonecache Overseer Bonny Pall, Clearcutter Boomerang Basics
For example, if youre building a deck around Urza, Lord High Artificer, you probably want a ton of cheap artifact creatures you can tap for mana, and then big heavy hitters you can cast with his second ability and all of that mana you generate