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This isn't to say that reveal cards are worthless. You'll often want to reveal weapons instead of discarding them, particularly if you're fighting weak monsters or you need to make a single weapon stretch over a few explorations. There are even some reveal cards that are widely useful.
PACG Strategy #3—Knowing Your Cards
A new PACG strategy article was published this week. It talks about the different play styles of different sorts of cards, from reveal to banish.