I also just played this deck in a local Legacy tournament with 24 people. Went 4-0-1 with an intentional draw to the mirror (we both finished 4-0-1). I didn't run the discard package since I do not have the delta's and don't want to run just one sea as a black source. I used a fairly standard decklist as follows.
7 fetches
8 islands
4 City of Traitors
4 Show & Tell
4 Omniscience
4 Dream Halls
4 Cunning Wish
4 Brainstorm
4 Ponder
4 Preordain
4 Enter the Infinite
2 Pact of Negation
3 Force of Will
1 Flusterstorm
1 Intuition
1 Trickbind
1 Emrakul
SB
4 Leyline of Sanctity
3 Defense Grid
1 Force of Will
1 Echoing Truth
1 Wipe Away
1 Slaughter Pact
1 Eladamri's Call
1 Research/Development
1 Laboratory Maniac
1 Firemind's Foresight
Round 1 - Mono Black Reanimator
Game 1 - Choose to draw and put him on reanimator after I forced an entomb. He didn't draw much else and I killed him with dream halls into EtI to play around Iona.
SB
-2 Pact of Negation
-1 Show and Tell
-1 Omniscience
-1 Trickbind
-1 Island
+4 Leyline of Sanctity
+1 Echoing Truth
+1 Slaughter Pact (Not entirely sure on this choice, wanted a card to dig to if he reanimated Iona early.)
Game 2 - I get a quick Show and Tell kill with Slaughter pact backup in case of an Iona.
Round 2 Sneak and Show
I mull twice and keep a risky 5 card hand (omniscience land force Wish Enter) because I knew he was on Sneak and Show and he didnt know what I was playing. If he goes for an early Show and Tell then its pretty hard to lose this game. He doesn't and I lose to a Sneaked in Emrakul. My opponent puts me on merfolk cause I did absolutely nothing but play an island that game.
SB
-1 Cunning Wish
-1 Emrakul
+2 Defense Grid (Defense Grid into Shown and Tell allows you to win through Griselbrand and hands full of counters)
Game 2 is a really long game with me flustering a Show and tell and pacting a sneak attack. Eventually I draw the dream halls and EtI for the win.
Game 3 my opponent pulls to 4 and I win quickly with a show into Omni protected by defense grid on turn 4.
Round 3-Dredge
Game 1- I Force his first two plays (Breakthrough and Careful Stud) to buy some time. I win turn 4 or 5 with a dream halls into EtI
SB
-1 Trickbind
-2 Pact of Negation
+1 Echoing Truth
+2 Leyline of Sanctity (Not sure if the other two are necessary, decided to opt for consistency with the combo)
Game 2- I lose a show and tell to a blind t1 therapy. I force his first breakthrough and fluster a faithless looting. He resolves a breakthrough on his next turn and discards a ton of dredgers and bridges. I cantrip a few times and pass back. He doesn't dredge any narcomoebas to flash back the therapy (Would have had to name EtI anyways since I had omni and halls in hand with a show on top). I kill him next turn with the Show.
Round 4 - OmniHalls
We intentionally draw the mirror match. Could have played it out since he was on the mono blue release the ants (hadn't gottten the research/development in time for the tourney). Without the black splash, the ants kill is way worse since an Emrakul in my top 17-18 is unbeatable after he casts an EtI so he basically has to rely on wish into eladamri to win.
Round 5 - Deathblade with extra discard
Game 1 wasn't very exciting, he plays a deathrite and stoneforge and I win with an early show and tell with protection.
SB
-1 Trickbind
-1 Intuition
-1 Emrakul
-1 Dream Halls
+4 Leyline of Sanctity
Game 2 I have a Leyline in the opener with some fetches, cantrips, and a show and tell. He has a fast start with an early stoneforge and bob. This was the one game I missed being able to wish fr a Pact of Negation. Due to all of the fetching and early pressure I had an awkward situation where I was at 3 life after an attack with 2 island and 3 fetch in play. With a pact in the sb, I could wish for pact eot (going to 2) and show for the win with double counter backup. Since this was not the case, I went for it with just a FoW and lost to double FoW.
Game 3 I mull to 6 and keep a really solid hand with double show and tell and a pact. Discard takes a pact and Show a few turns later into Omni with force and wish backup. I wish for a trickbind to counter the D-Sphere trigger and win that turn.
This was my second time playing the deck in a legacy tournament (Went 5-1 at GP Las Vegas side event) so I am not 100% on some of the sb choices. I will definitely be adding in a pact of negation to the sb and will probably switch to the discard package as soon as I can get some delta's. Other than that, the deck feels insanely strong right now.
I haven't had much difficulty with the D&T matchup. The hatebears slow you down but don't put you under a very fast clock. As long as you hit your land drops to offset their mana taxing effects you should be fine. All of my losses to this deck have come from disruption + a fast clock (usually involves a t1 vial) or from them drawing a ton of hate post sb. G1 is likely in your favor and post-SB games depend on how much hate you have to fight through. The lists I have played against generally have 1-2 Canonist 1-2 O-ring and an enlightened tutor in the sb. I only ever try and remove a hatebear if I can kill them before they untap again. If they have a mom, I would abandon trying to remove the hatebears since its easier to go through them at this point. Its also really important to find the best line with your wishes and use them early, since your mana is gonna be really tight the entire game. Wishing for either Eladamri's call if you are going Emrakul or wipe away are prob the two I use most often. Also, don't be afraid to get your omni/halls under an O ring. This allows you to bounce the O-ring eot and go off with lots of untapped lands to pay for the taxing effects.
Basically dig hard for a show and tell, matches without it are significantly harder to win and hope D&T doesn't establish a really fast clock.

