Misthollow Griffin

The recursion logic here runs backward from every graveyard engine. Most creatures that want to come back must die first, then claw their way out of the yard; this one's static ability simply grants permission to cast it from exile, which turns a zone most decks treat as a dead end into a permanent home base. Once it sits in exile, it stays castable indefinitely: a 3/3 flier you can pick back up turn after turn. The whole design lives in that single permission. It does not loop by itself, though. The permission only says you may cast the card, not that anything sends it back to exile for free; to abuse it you need a separate piece that repeatedly exiles it and the mana to recast it, at which point the never-expiring permission does the rest. The body is deliberately unremarkable; the rate is beside the point. What keeps it in check is where the permission applies. Cast from exile, the spell still goes on the stack, and a counterspell answers it like any other, dumping it into the graveyard where the static ability does nothing at all. Mill it, discard it, or let it die in combat, and it is just a creature card in the bin, no different from any other 3/3. The exile zone is its sanctuary; everywhere else, it is ordinary.