Xylia
Terrarian
How did we survive when magic mirrors used Mana?
Rather easily, because it was only 10 (or 20?) mana which takes all of two seconds to recover. Though if you found a mirror really early in the game and this was back during the era where you needed 10 stars for one crystal... well.
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I still do that nearly all the time because you know, force of habit from playing so much before auto-mine.
That and Auto-Mine is... quirky at times. I use it for long tunnels and such, but I use manual for a lot of stuff still, because of the unpredictability.