Mardu Heart-Piercer

Raid is a mechanic built on a sequencing puzzle, and this is one of its plainest statements: the body is a forgettable 2/3, but if you swung first, dropping it converts into a two-damage bolt stapled to a creature. The trick is that the condition checks whether you attacked this turn, not whether the attack connected, so the reward is available even when your aggression got chump-blocked or traded away. That detail is what makes the design coherent rather than punishing. An aggressive deck is attacking regardless, so the raid clause rarely asks you to do anything you weren't already going to do; it just pays you for committing to the plan. The cost of the upgrade is paid in tempo and order: you have to be the deck that turns sideways before it develops, and a four-mana 2/3 with no removal attached is a genuine disappointment when you're on the back foot and have nothing to swing with. Mardu Heart-Piercer encodes the whole thesis of go-wide red aggression into a single trigger: keep the pressure on and the board state rewards you, ease off and you're left holding an unremarkable 2/3 archer. It is the kind of role-player that defines a mechanic precisely because it does nothing clever beyond it, a clean demonstration of how a conditional trigger can ask a deck to prove its identity before it gets paid.