As long as you're using it in casual, there's something very important that seems to be overlooked here.
The mirror doesn't exile itself, it's merely sacrificed. Just make sure one of the seven is Argivian Restoration, or anything similar.
You could possibly use it as a counter measure against a dedicated mill deck. When your whole deck is in the graveyard, crack a Relic of Progenetus, followed by the Mirror with the Restoration on top.
Other uses involve giving it to someone, and then Mindslaver-ing them into using it recklessly.
Posted By:
PhyrexianAdvocate
(1/7/2011 8:29:20 AM)
Laboratory Maniac
Posted By:
Arachibutyrophobia
(9/14/2011 8:06:30 PM)
Such an AWFUL card that will have about as much play time as the dreaded Lich's Mirror. Those 7 cards you return had better be some very impressive cards, and I cannot see this getting much use except in very specified situations where your opponent is insane with the exiling.
Posted By:
Oleander
(7/11/2009 4:26:57 AM)
This card is awesome- Combine with Relic of Progenitus and Nature's spiral and you can have the seven cards that you want from your deck in the order that you want. It is so broken and comepletely ruins the game because you can easily path your own and get it out early and start to get your best cards right away. Go ahead and keep firing off lightning bolts because you can keep stacking them up, until you kill your enemy.
Posted By:
Tennanja
(7/13/2009 3:40:36 AM)
If you can manage to build a deck specifically with this card in mind, it's not that bad.
That being said, We got two of these in a draft and they were passed to the last pick every single time. Along with Nightmare, curiously. No one was playing black.
Posted By:
Owls_and_More_Owls
(8/27/2009 1:43:36 PM)
Mirror of Fail.
Posted By:
Vinifera7
(7/11/2009 4:49:28 PM)
possible combo with isleback spawn?
Posted By:
catowner
(7/14/2010 3:29:58 PM)
Combos with Arc Slogger
Posted By:
getz19
(4/10/2010 1:06:52 AM)
So Sucky
Posted By:
MasterOfEtherium
(7/14/2009 12:28:50 AM)
I can't figure out why this card was included into the core set - let alone with a rare status. It eludes to some very abusive utility, but I can't think of any good reason to include this in a deck worthy of anything more than the kitchen table. The only use I could see this ever providing, would be either sideboarded against an opponent who exiles the crap out of all of your important permanents, or, main decked with a very peculiar and specific set-up to mastermind the perfect seven card library and execute the mother of all combo plays. Interesting idea on paper, but useful?
Just an idea off the top of my head, but would this have been to much to ask? 
, Sacrifice Mirror of Fate: Exile up to seven cards from your library face-up, then exile the rest from the game face down. Return the face-up exiled cards to your library in any order.
To me, that would have actually made sense and been worth all the trouble of exiling the bulk of my cards. Instead, I'll need ... (see all)
Posted By:
Hayw00d0909
(4/29/2011 3:07:39 AM)