Time Warp card - what exactly does it cancel?

[ComBAT]

I have tried to search for this in existing threads, but could not locate the answers I was seeking.

I don't recall the exact text on the card, but I believe it says something along the lines of "allows you to cancel any trap or one-shot card immediately after they are played".

My group was trying to figure out the definition of a one-shot card. We decided to consider any card that has the text "Usable only once" as one that may be canceled immediately after it is played.

The confusion is that through out the general Munchkin instructions, it references "one-shot items" as "usable only once". Not all treasure cards that have "usable only once" have a Gold/Credit value, therefore they are not considered items.

So my question is, generally what cards are considered "one-shot" cards that Time Warp can cancel?

PS: I may be completely wrong about the text on the card as I don't have the card in front of me.