Duelist's Heritage

Double strike is a keyword printers usually charge for once, baked into a creature's body or stapled to a one-shot combat trick. Here it becomes a recurring grant that costs nothing per use after the enchantment is down: every combat, a creature gets to hit twice, and the targeting clause is wide open about whose creature it is. That last detail is the design lever that matters. The trigger fires on any attack and lets you choose the target, so the obvious play (handing double strike to your own biggest threat) is only half of what the card was built to do. It rewards pointing the buff at someone else's attacker to broker a swing, sweeten an alliance, or turn a neighbor's incidental attack into the one that ends a third player. The cost is the timing: this works only in combat, only on creatures already attacking, and gives no defensive value at all, so it sits in the slot of a payoff that needs an aggressive board to mean anything. What it offers in exchange is a doubling effect that doesn't ask you to commit further mana every turn, which is rare enough that the enchantment quietly multiplies any other combat math you've already set up: trample, deathtouch, lifelink, and on-damage triggers all scale with it.