Expressive Firedancer

Prowess with a ceiling, and the ceiling is the whole point. Where the old spellslinger one-drops and two-drops rewarded quantity (cast anything, get the pump, chip in), Opus here rewards weight. The base trigger is the familiar +1/+1 per spell, but the double strike rider only fires when five or more mana went into the spell that turned it on, which reorients the deckbuilding around your top end rather than your cheapest cantrips. That is an unusual demand for a two-drop attacker: normally the aggressive spellslinger wants a curve of one-mana burn and cantrips to fire the pump repeatedly, but this body climbs from a 2/2 into a genuine finisher only when you cast a real spell, and then swings for double. The tension is real: cheap spells keep it alive and growing incrementally, but the payoff sits behind the expensive haymaker you are already casting for its own effect. It is a design that asks a spells deck to want both halves of its curve at once, and it converts a big X-spell or an overloaded modal card from pure tempo into lethal reach in the same turn you cast it.