How many basic lands should I have in a B/G\R deck
Well that would be contingent on a couple things...is your deck a aggro, mid-range, or control style deck? Also are you using duel and/or shock lands?
Aggro and I'm using as many dual/ shock lands as I have
In all honesty, I don't use basics in three color decks. However, I don't play aggro. Shock lands are probably going to be your best friends. Being able to get T1 stuff going is phenomenal. Playing a {Woodland Cemetery} T1 seems pretty lackluster. Playing an {Overgrown Tomb} and whatever 1 drop you want is good (even at the cost of 2 life.) Any chance you've got a deck list up?
Yeah it's over in the casual aisle