37-72 of 592 cards where the rarity is common

Ballistic Bot
Bandle Commando
Bandle Painter
Barkbeast
Bastion
Battle Bonds
Battlefield Prowess
Bayou Brunch
Bear Stance
Behold the Infinite
Belvethi Elder
Benemone
Bitsy Lizard
Black Spear
Blade
Blade's Edge
Blade Squire
Blastcone Seedling
Blinded Mystic
Bloodbait
Blood for Blood
Blood in the Water
Bloodthirsty Marauder
Bloody Business
Blooming Cultist
Blossoming Blade
Blue Sentinel
Boar Stance
Bomber Twins
Bone Club
Bone Scryer
Boom Baboon
Boomcrew Rookie
Bouncing Bomb
Boxtopus
Brightsteel Protector