Quicksilver, Brash Blur

The whole design is a race against your own mana curve, and the discount clause encodes the character's speed as a literal timing puzzle. The opening-hand line lets him arrive as a hasty one-drop swinging from the first turn, but that is bait: a 1/1 that trades with everything and folds to any removal. The engine is the power-up, and its cost bends around a single window. The activation is a heavy tax on a body this fragile, so the ability shaves off his mana cost () on any turn he came down fresh, dropping the activation to . Cast him for and immediately power him up for (a total of across the turn), and you have a 2/2 double striker with haste that hits for four before the opponent has untapped. Let a turn pass and the discount evaporates; you pay the full to activate on top of whatever it took to keep him alive. The fastest man alive is only cheap while he is still moving, and every idle turn hands the tempo back to the defender. The reminder text that each power-up ability fires only once caps the ceiling so he cannot snowball unbounded, and the double strike counter is what converts a token-sized body into a real clock. He punishes hesitation on both sides of the table, including yours.