This is right up there with the Power Nine. Actually, for a deck built around Time Vault, it's even better than any of them. Oh, I can just imagine creating THE deck like this:
4 Time Vault
8-16 card-fetch or card-draw (Timetwister)
8-12 untap spells and repeat untap creatures/artifacts (ie. Twiddle, Voltaic Key)
12-16 lands that produce blue and/or colorless mana
12-16 mana generating artifacts or creatures (Black Lotus)
6-8 counterspells or recalling spells (Unsummon, Cancel)
2 Solarion
Then, on your average hand you may (1) play Black Lotus and a land, play Time Vault and Twiddle and then tap for another turn; or if you're not so lucky (2) play a land and mana-generating artifacts, use the mana to play a card-fetch or card-draw spell so that you get cards like Time Vault and Black Lotus, then play the Black Lotus to put Time Vault into play, then tap the land to play Twiddle; or if you're really unlucky, (3) rinse and repeat.
I've never actually assembled such a deck but it's co... (see all)
Posted By:
Starbrilliance
(9/6/2009 7:23:21 PM)
This is basically the most powerful card ever printed. Makes Ancestral Recall and Black Lotus look like garbage.
Posted By:
bowlofgumbo
(12/6/2009 12:56:04 PM)
Use this with Fatestitcher and you win. Period. End of Story. Godd day, sir.
Posted By:
raptorman333
(11/10/2009 11:23:05 AM)
I have always loved the art for this card. It is too bad that it won't be reprinted. Maybe a promo? Sadly, no chance.
Posted By:
Chimzar
(11/12/2008 4:58:43 PM)
gotta love the old over powered cards :)
Posted By:
theabyss
(12/3/2009 3:35:14 PM)
The original text and the oracle text of this card make it into 2 totally different cards. The original says that you MUST skip a turn to untap it, whereas the oracle text says that skipping a turn is only a way to untap it. So, needless to say, the oracle card is stupendously broken, whereas the original is a worthless 
artifact that does nothing to help you win.
For extra turns, use Stitch in Time + Cloven Casting.
Posted By:
Weretarrasque
(10/27/2009 6:48:26 AM)
The original wording of Time Vault is:
Tap to gain an additional turn after the current one. Time Vault doesn't untap normally during untap phase; to untap it, you must skip a turn. Time Vault begins tapped.
It clearly states that you must skip a turn to untap Time Vault.
Why not word it so that no other untapping won't work. This is my take of the Oracle wording:
Time Vault enters the battlefield tapped.
Time Vault doesn't untap unless you skip your turn. (You can only skip your turn when your turn is about to begin.) If you would begin your turn while Time Vault is tapped, you may skip that turn instead. If you do, untap Time Vault.
Tap: Take an extra turn after this one.
Posted By:
tavaritz
(4/21/2011 1:34:31 PM)
This card better be banned. Because all you need is a steady way to untap an artifact, such as Tezzeret the Seeker, and you have infinity turns!
But with no ways to untap this card, I don't see the point of it. You skip a turn to get an extra turn. It's like making your glass half-empty to half-full.
Posted By:
Arachibutyrophobia
(6/28/2009 8:56:15 PM)
this is a card involved in so many infinite turn combos its ridicules but if you have to resort to a infinite mana or infinite turn combo for a deck your really just not trying
Posted By:
aba1
(4/11/2010 6:57:20 PM)
Fatesticher? Try voltaic key... Good day to YOU sir...
And why is this not banned across the board in every possible legality?
Restricted doesn't sadisfy me in the slightest.
Posted By:
BlackAlbino
(8/12/2010 7:36:28 PM)