I don't know what I was smoking before when I tried precogs and didn't like them.
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http://helltgivre.free.fr/elements/?mark=4sm&deck=z64vjz67dpz67dqz67qbz6809)
As explained above, assuming you can always play the precogs straight away (you often can, but not always), this is essentially a 24 card deck. And the ability to see the opponent cards is often useful against T50, as it shows you if they have Rain of Fire, Black Hole, or Miracle. Against AI3 it is nice to see if there is a Thunderstorm card, since that card is pretty lethal against newly played golems: but luckily, the AI will not play it if you only have two creatures.
This works better for T50 grinding
when upgraded than the original ai3 deck used by plastiqe (upgraded in the obvious ways), or the graviton firemaster variation with fire mark. You'd think to look at it that you would often not have the quanta to use the precogs, but this is never really the case...
More specifically. every time I draw a precog with this deck, I imagine, "would I rather have drawn a graboid/forest spirit/werewolf?" The answer is always "No.". I work out in my head that I would by this point have a 6/6 werewolf down by now, but then I draw my first cremation, and think "I would have to wait a whole extra turn to get that", and basically that convinces me I'm better off.