man, people don't seem to understand Reno Jackson. Strifecro was asked about it on the stream and it was just making decks around singles and all that....
If you're drawing almost your whole deck almost every game, it doesn't matter, like in freeze mage. The chances of you having two copies of a card in like your last 7-8 cards are pretty low.
Yet if you do have dupes in the bottom of your deck, you are dead with Reno in your hand. Think of Joust, even a small chance of failing, makes the card unplayable in the long run.