What weird deck restrictions do you give yourself?

I have a few odd restrictions that I typically implement. The weirdest restriction that I have is that I try to balance my colors as close to evenly as I can. I can’t stand when a multicolored deck has 70% of one color and 30% or less of another. I also try to avoid tutors and try to avoid Phyrexians unless they are particularly synergistic or flavorful for my deck. What weird restrictions do you implement?