ControlNode wrote:
(I think cards outside the game should be exempt from 1/deck rule since they are not in the deck+SB)
That is something that should be cleared beforehand for sure. General consensus if you read those threads is that allowing wishes or similar cards to work, they would still abide by the commander colour identity and limit of 1 (barring things like Relentless Rats that specifically say you can have more than 1 of them.)
That said -- ran into someone who said that in their commander deck they would use
Ring of Ma'Ruf to get a Charizard card and then put it into play (it didn't do anything, it wasn't a creature so couldn't attack, it's not a player or planeswalker so you couldn't attack it, etc.) I found it hilarious that, were I ruling on it, I'd allow it in my group if thats' how they wanted to use their resources

So it can really depend on the group, and if you 'abuse' their trust or not. Remember the goal is to have fun playing the format, but that doesn't mean at the expense of your opponents having fun (obviously you want them to lose, but they probably wouldn't like to lose to something they feel is 'cheezy' (which is very subjective.))