some priest help nedded

hi guys so I went and made me this priest deck http://www.hearthpwn.com/decks/909183-my-control-priest I'm still missing 1 shadow visions and 2 dragonfire potion I have enough for either the second shadow vision or 1 of the dragonfires but this isn't the issue I need some help with the gtameplay cause I don't think this deck is that bad except to 1 game against paladin I lost like 5 or 6 game in a row and I wouldlove the help