Narset, Enlightened Master
Declare her as an attacker and the payoff resolves before blocks: exile the top four, then cast the noncreature spells among them for free, all of it landing on the trigger rather than on combat damage. That timing is why the fragile 3/2 is forgivable; the reward never asks her to survive the block step. What the restriction demands is discipline in the cards you surround her with. Every slot has to earn its place twice: once as a hit you are happy to flip into, and once as a card that keeps the chain of free casts alive. Load up on rituals, extra-turn spells, and tutors that feed one another, and a single attack snowballs into an explosive turn; pad the list with creatures and she stalls, since those exile face-up and do nothing. First strike still matters for surviving a blocker, but by then the spell cascade is already spent. Hexproof is the load-bearing keyword: a free-spell engine welded to a two-toughness body invites any targeted removal, and denying that interaction is what lets her connect a second time. She belongs to a family of free-cast attackers whose ceiling rises with how ruthlessly the builder trims everything around them, and few gate the reward as cleanly: noncreature only, off the top four, until end of turn, with no consolation for whatever you leave uncast.
