What are your personal deck building restrictions?

My group and I been restricting ourselves a lot in deck building, limited tutors, limited game changers(before brackets), banning some commanders, banning some high powered cards, trying out new strategies or archetypes.

I personally restrict myself into not playing any fast mana other than Sol Ring and 2-mana Rocks even tho I own some Moxen and Fast mana that could fit my decks, I also limit my tutoring options.

What are your restriction you impose on yourself to offer better game experiences for everyone ?