[Clipper]

The only potential way I can see out of that situation would be to try to get the other Cleric to discard his Class before you backstab (threatening to let the other player win the combat otherwise). It stinks a little bit of king-making, but would stop the fear of Divine Intervention ending your game. I do love the concept of all the Level-9 Clerics agreeing to mutually disarm themselves, though...

It's a real pity you had no other cards in your hand to discard instead.