Werefox Bodyguard

Blink-and-hold effects, Banisher Priest and Fiend Hunter among them, temporarily pocket a creature until the exiler leaves the battlefield, but they arrive on your own turn, telegraphed and open to a response. Flash rewrites that entirely. At instant speed, the enters trigger becomes a combat trick: hold it up to strip a blocker off an attack or vanish an attacker before damage, a tempo swing the older sorcery-speed jailers could never stage. The "non-Fox" clause is quiet but pointed design work. It carves an escape hatch that most exile-on-a-stick creatures lack, so the card cannot cleanly answer another Fox and, more practically, can be blanked by any deck fielding its own. The sacrifice ability is not an off-switch for the prison; because the exile lasts only until this creature leaves the battlefield, cashing it in for two life immediately hands the caged creature back. What that gives you instead is an exit valve on your own terms: when the tempo has already been spent and the 2/2 body is a liability, you convert it into life and accept the return rather than chump-blocking or trading it away. The prisoner always comes home eventually; the ability just lets you choose the moment, and take a small dividend on the way out.