Quote Originally Posted by Balmas View Post
Batmare, obviously.

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It maybe somewhat evil of me, but I think there might be potential for mirror abuse, and not just the shenanigans way.

For example, grab a fairly innocent pony, perhaps Applebloom, and load her up with two saddlebags full of bits. Send her through the mirror ad nauseum. Collect the bits. Zap away the extra Appleblooms; you could set up a password to reveal the true one, like "Zecora." Crash the economy with your mountain of bits.
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We don't know if the pool duplicates inanimate objects though. Or it might be that only what is reflected is duplicated, so the saddlebags would duplicate, but since the bits inside aren't visible in the reflection they wouldn't be copied.