Xande, Dark Mage

The scaling clause here is the whole tension: a 3/3 body priced at four that only grows when the graveyard fills with instants, sorceries, artifacts, and enchantments. That is a narrower fuel than the count-everything graveyard payoffs in these colors; lands and creatures do nothing for it. Building it up means playing a deck that generates spell-shaped chaff and lets it accumulate, which pulls against the natural instinct to keep casting cards from the yard. Menace is the piece that turns the size into a clock rather than a stat line: once the body outgrows a single blocker, the evasion means two creatures have to gang up on it, and in a grindy blue-black shell those double-blocks are exactly what the opponent cannot spare. The design leans on Xande being both threat and reward, so the creature wants to arrive after the graveyard already has depth, not before. That sequencing (deploy a curve of cheap spells, then land the payoff) is the archetype it belongs to, and it is a familiar Dimir shape: cast spells, exile nothing, cash in a graveyard the opponent has been letting you fill. The ceiling scales with how disciplined the pilot is about leaving noncreature spells in the yard rather than recurring them, which is the honest cost of the ability: every flashback or delve you fire off shrinks the payoff you just committed to the board.