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Caravan Guard came out of looking specifically to see if I'd missed some corner of possibilities for Durations. This is a Duration that's a round faster if you get attacked. The phrasing was an issue; what if you play it on someone else's turn and have a + token on the pile? I decided that playing the card was just way simpler than simulating playing it, and in the end it got some explanatory text.

—Donald X. Vaccarino, The Secret History of Dominion: Adventures