forget about bitcoin to buy drugs, go for pot 
being serious, there are better options now. no need to mix coins, just go for some anon coin like xmr/shadow/nav
being serious, there are better options now. no need to mix coins, just go for some anon coin like xmr/shadow/nav
Most of the dark markets accept only Bitcoin. A few of them may accept Litecoin or Ethereum. But I don't think that any of them accept these little known altcoins suhc as XMR and NAV. So it is not possible to buy anything with these coins.