UR Aggro's Slickshot Show-Off and Elusive Otter are vulnerable to a swept Fire Magic, so the extra copies give us more sweeper density against their cheap, small threats. Sear picks off a Slickshot Show-Off even when it is pumped, but it does not kill a 5/5 Eddymurk Crab. Disdainful Stroke is our answer to the Crab, since its mana value stays 7 no matter how cheaply it is cast. It can't counter cheap spells like Burst Lightning, kicked or not, because kicker doesn't change mana value. Consult the Star Charts and Duress are too slow and low-impact against a deck trying to race with cheap spells and evasive threats, so they come out for more proactive removal.