Narset, Enlightened Exile

Graveyard recursion that reads the whole table, not just your own yard: every attack pulls a noncreature, nonland card with mana value less than her power from any graveyard, exiles it so it never comes back, and casts the copy for free. The scaling is the trick. She grants prowess to everything you control, so the anthem does double duty: it pumps her the turn you cast a cheap spell, and every point of power she gains widens the pool of cards she can steal. Swing for four power and the reach covers a three-mana burn spell or ritual; sculpt a bigger board precombat and the ceiling climbs with her. That precombat sequencing is not optional, it is the whole rhythm. The trigger goes on the stack the instant you declare her as an attacker, and you lock the target then, so her power must already be raised: cast your prowess spells in the first main phase to unlock a bigger swing, not mid-combat to chase a larger copy after the target is fixed. None of it depends on her connecting or surviving, because "whenever Narset attacks" triggers on declaration, so the value lands even into a wall of blockers. Where earlier Jeskai spellslinger commanders paid off noncreature volume with damage or cards, this one launders spent spells (yours and the opponent's) into a recurring attack-step resource.