"Mediatization of a Card Game: Magic: The Gathering, Esports, and Streaming"
Prereleases are great because the set is brand new, the footing is fairly equal as everybody plays with the set for the very first time, and you're all just relaxing and having fun exploring the new cards
For that reason, it's the only Power 9 card that isn't banned in Commander
It can also be used as a combat trick, allowing you to spread Auras and Equipment between several creatures, then move them to the ones that weren't blocked , or even to save an important creature by moving your Lightning Greaves onto a creature being targeted by a removal spell.
Sure theres the chance it gets blown up and undone, but the ability to exile any nonland permanent easily outweighs that
If youre getting big Magic: The Gathering vibes from Magic Mirror, youre not alone - and thats not necessarily a bad thing