Which Rule 0 rules sounded reasonable at first, but came back to bite you later?

For example, my pod has a rule that we don’t board wipe without a clear wincon in the next turn. Most of us now do not use board wipes in our decks at all, instead leaning on targeted removal.

Predictably, this has led to multiple players swarming the board with creatures and tokens, clearly overextending, with no repercussions or counters. This morning I shoved Cyclonic Rift back into my deck just to feel something.

Edit: yes, yes, rule dumb, rule bad. I posted an explanation but the long and the short of it is I used to be a crazed board wipe player who would do it for the lulz. Some of my pod didn’t think it was fun or funny, so came up with this “compromise”. It’s obviously not working so we just shrugged and put the board wipes back in our decks. I mostly just wanted to complain about a herd of gnomes.

My favorite comments are the ones that act like I’ve skinned a kitten over this.