Burst of Speed

Mass haste for one red mana is the enabler half of a particular kind of red blowout: the turn where a board of summoning-sick attackers all swing at once. Where Fervor and similar enchantments bake haste in permanently, this sorcery buys the effect for a single turn at the lowest possible rate, which makes it a combat-trick line as much as a deckbuilding choice. The natural pairings are token swarms, a freshly cast army, or a board hit by a sudden flicker effect: anything that lands a pile of creatures into a window where the opponent assumes they're safe until next turn. The sorcery-speed restriction is what prices it down, and it points the card squarely at the precombat main phase rather than the surprise-blocker math that instant-speed haste granters would invite. The catch baked into one mana is that haste does nothing for a creature that already had it, so the effect is dead weight unless your board is wide and recently arrived; this isn't a card you draw and use on autopilot, but one you build a turn around. It sits in the long line of cheap red haste grants whose job is to convert a developed board into immediate damage, trading the permanence of an enchantment for the cost of a single point of investment on the turn it matters.