http://mtgvault.com/phillyp/decks/omniscience-vintage/
The deck relies ENTIRELY on finding and resolving a Show and Tell. With the inclusion of Mox's and a Black Lotus in the deck, it is capable of a turn 1 win.
A resolved Show and Tell usually means a win. There are a few different options for cards to put into play with Show and Tell. Ideally, Omniscience is the best card to choose when you play Show and Tell because it allows you to play everything else in your hand for 0.
After you play Omniscience, you can cast Emrakul, the Aeons Torn for 0 and generate an extra turn! (Note: You don't trigger the extra turn if you select Emrakul as your Show and Tell choice since this is not the same as casting it)
Another way to win is to play Burning Wish when Omniscience is in play. This allows you to go get a Petals of Insight from your sideboard and put it into your hand. You then cast Petals of Insight over and over again (cycling through your library) until you generate a massive storm count and find another Burning Wish. You then can go get Grapeshot from your sideboard and cast it, taking advantage of the storm count for lethal damage.
The remainder of the deck is made up of:
A) Cards designed to help you find all of the "combo pieces" I've shown above. And,
B) Cards to protect the combo / slow opponents down (i.e. Counter magic and targeted discard).
Now onto the results!
Match 1: I end up getting paired against a kid who I've played against before in other events. We had an "incident" at a booster draft where he got all butthurt over me making a slow decision to counter one of his spells. I REALLY want to win this one but he tells me he's been playing vintage for a long time and I know I'm probably screwed...
... I was correct in my assumption and lost game 1 pretty quickly. He is using this broken combo to create infinite turns in his deck:
Despite the fact that Time Vault says "to untap it, you must skip a turn", this is allowed. Wizards decided to make a rule change that allowed for it several years back. Not suprisingly, Time Vault went from being a $35 card to being a $275 card as a result of this change.
For game 2, I put a Pithing Needle into my deck from my sideboard. I figure I can shut down his stupid combo with it. Sure enough, I draw a pithing needle around turn 3 and I can see he has everything in place for his combo except the time vault. Then for some STUPID reason I decide that I'm safe for one more turn and pass the turn without playing the pithing needle. He plays Time Vault and generates infinite turns. FML!
Loss 0-2
Match 2:
Play some guy who has a deck with the following broken combo:
Those two cards together generate infinite mana since you get three mana each time you sacrifice black lotus and you can get it back for only 2. I don't even remember what he did with the infinite mana but it was something that put me from 20 life to 0 instantly.
I actually managed to win a game against this guy but ultimately lost in 3.
Loss 1-2
Match 3:
For this match I play one of the store employees. Suprisingly, his deck was pretty fair and just had lots of good removal, draw engines, and one big creature. We split the first two games and he kindly concedes game 3 to me because he has to go do some work. Nothing notable here.
Win 2-1 (concede)
Match 4:
I play a guy with the same stupid broken combo as my Match 1 opponent, fortunately for me he was never able to get it out. He won game 1 by turning his two Mox cards into 5/5's with Tezzeret the Seeker, while I struggled to find a Show and Tell.
Game 2 I was able to find a show and tell quickly and got Emrakul into play for some face smashing.
Game 3...F'N game 3 is where I made the biggest mistake ever. I get my combo together and even have some sweet counter magic to back it up. Here's the following sequence of events:
Me: Tap all of my mana to play Show and Tell
Opponent: Taps all his mana (4) to play Mindbreak Trap
Me: Respond with Daze, returning an island to my hand:
Opponent can't pay 1, so Show and Tell resolves. I put Omniscience into play. I follow that up by playing Emrakul. He responds to that with a second Mindbreak Trap, paying 0 for it because it was the third spell I cast that turn. I wasn't expecting that! This is the part where I go full retard....
I look at my hand and I have a Force of Will.
My first thought is..."I don't have a blue card to pitch to it damnit!"
My second thought is..."I'm tapped out of mana so I can't pay for it"
My third thought is..."well at least I get an extra turn from Emrakul!"
I let his Mindbreak trap resolve...take my extra turn and draw land. I draw land for the next 2 turns and eventually lose.
It wasn't until (much) later that I realized that I had a F'N Omniscience in play and I could have played Force of Will for 0 to counter his mindbreak trap! Literally would have won the game AND match if I did that.
Loss 1-2
Match 5:
I meant to drop out of the tournament before this round started but I didn't get to in time. I decided I'll just play it out even though I'm pretty much in last place. I play some kid who has a deck built around generating a big storm count and playing empty the warrens.
We split the first two games and then we move to game 3. I have a crappy hand but I don't care much anymore so I choose to keep it. On my first turn for some F'N reason I play a volcanic island (produces red or blue mana) rather than playing a fetchland (allows me to get an underground sea which produces blue and black). I pass turn and he plays Duress...
My best card is vampiric tutor...I didn't want to use it now, but now I don't even have the option because I have no black mana.
I could have played vampiric tutor in response to his duress, then I'd at least have a show and tell for my next draw...but I F'd up AGAIN!
Loss 1-2
Finished 1-4
I learned that it is very hard to stay focused over the course of 5 hours straight of magic. I made several small misplays throughout the way but 3 really big ones (which I shared above). I actually think my deck did pretty well considering it's not normal to the format. Every single opponent was caught off guard with my deck just because it's not one of the ten "standard" decks that dominate the vintage format.