Shire Shirriff

The clever pivot here is that the exile is not stapled to the creature's entrance for free: it costs a token you already have on the table, which reroutes the whole Banisher Priest template into a payoff rather than a standalone answer. The gate is broad, since any token qualifies (a spare Soldier, a Halfling, a Treasure, a Food, a Clue), so decks that generate incidental permanents get to cash the least useful one for temporary exile of an opponent's best threat. Empty-handed, the Shirriff is a vigilant 2/2 and no more; the "you may" and the "when you do" both hinge on having a token to feed it. The exile is the leash-not-kill kind: the exiled creature returns the instant this creature leaves the battlefield, so a fragile 2/2 standing on the board is what keeps the threat detained. That fragility is the balancing act. Free permanent exile on a two-mana body would be oppressive; making it a detention effect that any removal spell can undo, and paying for it with an existing token, keeps the rate honest without dulling the flavor. The design lands on a lawman who patrols the board (vigilance) and hauls off a single intruder, holding them until the deputy falls. It plays best alongside a stream of expendable bodies, but it spends from that board rather than adding to it, trading breadth for a temporary answer.