Furor of the Bitten

The +2/+2 here is generous for one mana, and the second line is why. The forced attack clause is the cost: enchant a creature with this and it loses the option to hold back, swinging into whatever your opponent leaves up regardless of whether the trade favors you. That tension defines a whole class of cheap, undercosted red Auras going back to the earliest sets, where the buff is sized for aggression and the drawback assumes you wanted to be attacking anyway. The wrinkle is that the compulsion is a property of the enchanted creature, not a one-time effect, so it reads cleanly onto whatever you target. Note that the enchant clause carries no controller restriction: you can drop it straight onto an opposing blocker and turn their wall into a forced attacker, marching it into your untapped board on your terms (a line that is more cute than reliable, since the buff helps them too). For a deck already committed to the red door, with a low curve and creatures meant to be in combat by turn two, the downside is invisible and the rate is the point. For anything trying to play a measured game, the lost ability to stay home is exactly the friction that prices the card out. It is a clean statement of red's deal: more power than the mana should buy, in exchange for surrendering the choice of when to use it.