Dimir Infiltrator

The body and the keyword pull in opposite directions, and that contradiction is the whole point. A 1/3 that can't be blocked is no clock at all (one point a turn barely registers), but guaranteed contact is exactly what some effects want: a saboteur trigger, a graveyard recursion, a discard or mill payload that needs a creature to connect. The unblockable Spirit is therefore a delivery system more than a beater. Its other mode is the search clause, which converts the same slot into a sorcery-speed tutor: pitch the Infiltrator, fetch any other two-mana-value card from your library to hand. The mana-value lock is what keeps that honest, since the keyword only finds cards sharing this one's converted cost. You pay a card and three mana to swap into another two-drop, not to escalate into whatever you please. The payoff for a control or combo shell is variance smoothing without dilution: rather than running a fourth copy of a situational answer, you run a flexible body that doubles as that answer's delivery mechanism, finding the right two-cost spell when the board is stable and presenting an unblockable conduit when it isn't. Holding the fetch to sorcery speed denies the instant-speed silver-bullet that would warp sequencing. That it wears a Dimir face is almost beside the point; the durable idea is a single card that is never strictly a blank, threat and toolbox folded into the same slot.