Can not we use a general ruling for infinite loops?
but some infinite loops are balanced because of cost/effect. sometime it takes enormous set-up/ cost to pull a loop with minimal effect. for instance, the
red book of westmarch loop isn't broken in my opinion, you can cycle through your deck, but it isn't an immediate kill.
also nazzy auto-corrupt is a good example. you had to get enough things to line up properly, and when you could do that, you corrupted the ring-bearer. but the requirements balanced the loop.
to destroy infinite loops is to remove a vital aspect of the game.