Gurmag Swiftwing

Three keywords on a two-mana 1/2, and not one of them touches the power: flying, first strike, and haste are all evasion and tempo bolted to a body that will never grow. The flying carves a lane no ground creature can contest; the first strike lets it swing into anything with 1 power and walk away, and trades up against other small flyers by landing its point before it absorbs one; and haste means that point of damage arrives the turn it does, rather than idling a rotation before it matters. The 1/2 frame is the entire constraint here: this is not a creature that wins races on stats, it is a creature that lands one point of evasive damage reliably and keeps a clock ticking regardless of when it shows up. Cast on turn two, it applies pressure immediately. Drawn late off the top, haste ensures it still swings the moment it hits the battlefield, and the first strike makes a retaliatory block into it a losing exchange rather than a free kill. Everything printed on it exists to let a small, fragile flyer attack profitably and instantly, which is precisely the slot a low-to-the-ground aggressive deck needs occupied: not a finisher, but a body that always does its small job the turn you play it.