Berserkers' Onslaught

Double strike has always been priced as a premium keyword: it doubles every point of combat damage an attacker deals, including first-strike and trample math, and the game has historically rationed it to single creatures through auras or built-in keywords. This enchantment removes the rationing. It hands the keyword to your whole offensive board at once, but only on the attack: blocking creatures get nothing, which keeps the effect anchored to the aggressive game plan it was built to accelerate rather than spawning a defensive wall-of-double-strikers stalemate. The five-mana price is the cost of that breadth; it does nothing the turn it lands unless you already have a board, so it rewards the deck that spent the early game flooding the table and now wants to convert width into lethal. The real multiplier shows up with anything that scales off combat damage dealt: lifelink doubles, deathtouch on a wide team turns every connection into a kill, and any "whenever this deals combat damage" trigger fires for each instance. Stacked over vanilla beaters it looks redundant; stacked over a board built for on-damage value it reads as a genuine finisher, which is the exact line a red aggro shell walks between curve filler and the card that ends the game.