Dúnedain Blade

The reduced equip cost is the whole design lever here. A generic +2/+1 for two mana is unremarkable Equipment on its own, and the equip is the tax that keeps it from being oppressive. But drop that equip to the moment the wearer is a Human, and the card stops being a curve filler and becomes a repeatable, cheap-to-move aggressive enabler: you can suit up a fresh body every turn without falling behind on tempo, chaining threats past removal instead of committing everything to one carrier. That tribal discount is doing the balancing work a keyword or a hard restriction would do elsewhere, gating the good rate behind a deckbuilding choice rather than a mana wall. The stat spread matters too: +2/+1 pushes power over toughness, which is the profile you want on attackers looking to trade up or force chump blocks, not on a creature trying to survive combat. It is a small, disciplined piece of type-matters design, the kind of Equipment that only reads as strong once every creature in the deck qualifies for the cheap equip, and only reads as fair once you remember most creatures do not.