Bravado

The math runs the wrong way for an Aura, which is exactly the trap. Buffing a creature based on how many other creatures you control means the bonus is largest when you're widest and smallest when you most need it: the moment a board wipe or chump-block war thins your side, the enchanted creature shrinks back toward its printed body, and the Aura's two-for-one risk gets worse the further behind you fall. That self-correcting scaling is what kept it cheap. Anthem effects that pump the whole team (Glorious Anthem, the various lords) reward going wide directly; this concentrates the same go-wide signal onto a single attacker, which is a fragile place to put it given that one removal spell costs you both the creature and the card. The reward is real when a token engine or a fast aggressive draw fills the board ahead of curve, and the bonus counts every other creature regardless of color or type, so the ceiling is genuinely high. But the design lives or dies on a deck that can keep bodies on the table, and Auras have always paid a tax for the privilege of attaching to something the opponent can simply kill in response.