First of all, I am a big fan of this deck. I use it almost exactly, except I take out a steal and add a quintessence. I also don't care for the mind flayer, it has an extremely useful ability, but this deck is all about drawing cards until you can get out a combo of otyugh + druid/queen. The eternity is really necessary b/c you will draw yourself out.
As for getting it, top 50 is the way to go. I find a cheap way to win is to go with a straight firebolt deck, with some deflag, 6 firebolts and the rest fire pillars (30 cards max). This beats most rainbows b/c of the ai, and is really cheap to make compared to other decks so it won't cost you much to find that eternity farm.