@ChubbyRain People are probably underestimating Gush, but I am not one of them.
I've written about this a little bit, and the only reason I haven't written more about it is that I don't want to see the card restricted (at least not in proximity to myself writing about it, I don't want to contribute or get blamed).
There are tons of great card-drawing spells in Vintage. Gush is just the cheapest. it's almost free. The loss of tempo sucks, except that if you build your deck correctly and play the card well the drawback is somewhere between negligible and a bonus! Most of the time people have to tap out to play Thirst or Gifts. This makes protecting those cards much tougher than Gush, you could potentially cast Gush and protect it with mana drain, Flusterstorm, Spell Pierce, and you've got two mana at least floating that you can pay for an opponent'spell pierce with, if you have a little extra you could probably pay for a flusterstorm too.
Does anyone know the exact statistics of saturation of Gush VS TfK? I know Gush is played in more decks, but I don't know what the difference is. And the best Thirst deck seems to be playing a couple copies of Gush too...