Problem with maxing misstep and thoughtseize is that they are not cards you like to see against workshop decks.
I normally prefer to play misstep or flusterstorm instead of spellpierce, but i opted to play the pierce because of the expected shop decks.

To reheat this thread.
After playing no Doomsday for a few months. I decided yesterday to play it again in a small tournament.

Went undefeated in it yesterday with a standard list.

1 Duress
2 Thoughtseize
2 Flusterstorm
2 Mental Misstep
4 Force of Will
1 spell pierce
1 mindbreak trap
1 Hurkyl's Recall

1 Ancestral Recall
1 Brainstorm
1 Ponder
3 Preordain
1 Gitaxian Probe
1 Nights whisper
4 Gush
1 Fastbond
1 Mystical Tutor
1 Vampiric Tutor
1 Merchant Scroll
1 Demonic Tutor
1 Time Walk
4 Doomsday
1 Tendrils of Agony
1 Yawgmoth's Will

1 Laboratory Maniac

1 Black Lotus
1 Lotus Petal
1 Mox Jet
1 Mox Sapphire
2 Dark Ritual

2 Island
2 Tropical Island
4 Underground Sea
4 Misty Rainforest
2 Polluted Delta
1 Flooded strand

Side:
3 Trygon Predator
1 Mox Emerald
1 Forest
1 Steel Sabotage
1 natures claim
1 Hurkyl's Recall
2 snuff out
1 Flusterstom
1 Nihil Spellbomb
1 Tormod's Crypt
1 Jixlid Jailer
1 grafdiggers cage

We planned on playing deathrite shaman instead of the mindbreak trap and the night's whisper. Because we expected a shop heavy metagame (it was) but in the end i decided to go back to standard list because i also expected a lot of oath players. 

Mindbreak trap was insane all day long.
Also with the matchups i faced i should have played the Loa instead of 2nd island.

2-0 burning oath
2-1 steel city vault
2-0 gush storm
1-1-1 gush talrand
2-0 Pyromancer Rug
ID Oath

Half finals: again against talrand gush player of round 4.
Win game 1 because of him  dropping a fast manacrypt and dying on it.
lose game 2 because of a few misplay's of me after clearing all his counters
win game 3 again on his manacrypt.

split finals with friend with oath

Really found the talrand gush matchup difficult to win. Most of all because he had multiple times Loa.
Maybe need to add a few swarms in side.

@ dark ritual

Tested yesterday your list together with Nirves.
Will summarize shortly my thoughts
Nights whisper and library were both really good. And I’m really looking to fit them into our current decklist.
Don’t know if the 4 ritual playstyle suits me that good, cause a few games I lost because I had to much rituals and to less disruption. But other games I won because of the extra rituals and a naturally drawn tendrils or demonic tutor….
So maybe i will change number of rituals depending on expected metagame

About your maindeck: I would switch the duress for a thoughtseize, snapcaster/deathrite/confidant are more played than misdirection and that would be the only reason to play duress.
I can see why you would play chain of vapor (for storm generator and catch all I guess) but I still prefer the hurkey’s recall. Because chain isn’t that stellar against workshop.

Post side against workshop
The snuf outs worked rather well. Don’t know If you want the full 4 in your deck (drawing them in multiples against full sphere hand suck). But they indeed allowed you to draw your hurkey’s and stretch the game till you can drop a predator/win with doomsday.
I don’t know if you can afford a “full” workshop side. Because I still think that 2 slots are to less against ichorid. You don’t have all the time a turn 2 game winning hand. And with the therapy’s they are capable in stripping your whole hand.

Hi, i was one of his teammates was in Bom with the oath player.

The reason he forced was the following:

After double Demonic Gwen thought his opponent certainly had at least another counterspell. He was actually playing around force, drain + flusterstorm.
In this case when Gwen forces, and opponent drains, than he can drop his second oath through the flusterstorm.
If he doesn't force there, his opponents possible flusterstorm+drain is live for his second oath.

In the end it wasn't needed.

Although he made during the day some strange plays (and misplays) this was rather a smart play to make in the end of a long day.