Dexterity cards are no longer used in any normal Magic format. And things like
Sol Ring and
Mana Crypt are not broken because they're limited by being one ofs, produce colorless, and honestly everyone who can afford it runs it, so it evens the playing field. If you make more than enough to afford it and your friends don't, then buy everyone a copy if u care that much.
Strip Mine isn't OP in any circumstance other than Crucible soft lock. It's trading 1 land for 1 land. Yes it disadvantages them but it has an impact on you too. If your deck is built to abuse things like that then so be it, you should ban OP cards not entire strategies, just because you don't like them