Hi there, I don't think that rx460 is currently profitable as it is wayback 2016 if you are planning to mine top 20 coins. There are now more appropriate gpu for mining, why not try 570s or 580s if your motherboard permits. Also, you should invest on the power supply, but a 750w gold or above for efficiency. You don't want to end up just paying your bills on your mining profit. You should also consider the electricity rates on your area as this will affect you profit.
Hey, I know they arent the best cards for mining but, considering to mine xmr or ETN. My daily return should be between 2.5-3 dollars on current difficulty.. My electricity cost is should be about 0,65 cents a day on stock settings. Also I m planning to undervolt the card. My intentions arent to make crazy profits, I mainly want to mine electroneum( fork of monero) because I bealive in the project! I think for this perpous my system should do just fine!