I create decks only using cards I own IRL, and I only have those
shock/fetch lands
Most of my playgroup's land collection comes from precons (they're all relatively new to the game I'm the only one playing for more than one year), so I consider both budget and power level to stay fair with my playgroup
The deck is in public so I can test it with them on untap.in.
And I used 100% multicolored cards (except some artifacts), just for the fun of it, even tho it lacks draw cards.