Reckless Rage

Four damage for a single red mana is a rate that would be illegal without a cost attached, so the design buries that cost inside the spell itself: you have to point two damage at a creature you control to fire it. That self-inflicted clause does two things at once. It demands a second legal target, so an empty board on your side bricks the spell entirely, and it forces a small attrition trade against your own creatures. Aggressive red decks pay it gladly because their creatures are cheap and disposable, and a one-mana answer to a four-toughness blocker is worth a couple of points off a one-drop that has already done its job. The line of cards that buy four damage cheap by attaching a drawback runs long: Searing Blood needs the target to die, Char and Skewer the Critics charge life or a condition. This one's tax is the rarest of those, a guaranteed hit on your own board, which is why it reads as a downside but plays as a non-issue for the decks built to use it. The wrinkle is that the two-damage half doubles as a trigger enabler. Point it at a creature with a damage-on-being-dealt-damage ability, or at a low-toughness body you were happy to trade away anyway, and the clause meant as a cost becomes upside. Damage marked on your creature won't shrink it, but it can finish off something already dented, or simply land where it does the least harm.