There's already another different thread for this specific thing, actually:
http://forum.dominionstrategy.com/index.php?topic=16947.0Two additional notes:
Stop posting Market Square + [trasher] gets lots of Gold. Yes. That's what Market Square does. It's not a combo, or particularly interesting. That's simply its job. If you can demonstrate a two-card combo with it unexpectedly sucking down 5 Provinces in 7-9 turns or something, like with Donate or Hermit, then sure, post it; otherwise, start learning how bad Gold usually is. It has taken me a long time to learn that, and my game has improved significantly. Learn to hate yellow cards, even Gold. My favorite thing to do with Gold gainers is trash-for-benefit them with cards like like Salvager or Apprentice. Every gold you gain should make you feel slightly uncomfortable trying to work how how you're going to draw it every turn.
That said, I do kind of like Rats + Monastery. For every Rat you play, you gain another card, so if you play Monastery at the end of the turn, it's almost turning each Rats into a trash-two. If you trash more Rats with the Monastery, you draw a card for each one, and since the ruling is that you trash the cards one at a time, you could potentially draw another card that you want to trash with the same Monastery, having earned multiple trashing opportunities. Now that is genuinely interesting..even neat and potentially useful.