Woah. This deck is just...strong. Don't see that very often.

How does the doomsday combo work in detail? Do you use a carddraw spell to draw all 5 cards at once?

Doomsday is what I like to call a toolbox combo There's no 1 specific way to perform it, but I'll go over the common ways I pull it off in this deck.

First, you will need Lab Maniac, some form of countermagic (Force of Will, Pact of Negation, Swan Song, etc.) and any one or more of the following: Necropotence, Brainstorm, Alhammarret's Archive, Sensei's Divining Top, Sphinx's Revelation or Erebos, God of the Dead in order to perform this combo. If I don't have any one of these, I fetch and order these cards: Force of Will, Laboratory Maniac, Brainstorm, Pact of Negation and Solitary Confinement. If I can, I attempt to just play out the game, holding FoW, Lab Maniac and finally Brainstorming to draw what remains, using Force and Pact to protect the combo. I grab Solitary Confinement at the end because if my combo has failed, I'll sit myself in a corner.

If I have any one or more of the combo pieces, I Doomsday for the others and try to win from there.

Some tips: don't combo out if there's mana untapped. A smart player will simply counter or kill the Maniac. Don't Doomsday if an opponent will have lethal on you. Don't Doomsday if there's a mill player at the table. Play the combo smart and you'll succeed.

Ah, thank you for the explanation.By the way, I think Telepathy would be pretty good for this deck.It seems bad, but it's really good in any controllish type of deck, especially for securing the combo win.

It's easily a good card, just not my first choice. I honestly prefer taking the risk and having to think a little bit more over knowing whether or not I can go off. It's more fun that way.

Interesting. Playing telepathy often stimulates my brain to think more.

Eh, it just feels a little too safe for my tastes.

Weird thing for a combo player to say, I understand, but since this is among the two most powerful EDH decks in my playgroup, playing more riskily is more fun for me, and all I would see with Telepathy is what EXACTLY I have to fetch with Doomsday to win. I enjoy taking risks, so I inherently put risks in.

Hooray for Esper!

I found that Exquisite Blood + Sanguine Bond was a little to pricey for a combo. Sure there are ways to cheat it out, but I find that cheaper is always better!

May I suggest replacing them with a Helm of Obedience combo?

I actually have Helm combo in another deck...probably will do the switch for early kills, but I prefer the Doomsday win instead.

Have you thought about Sun Droplet

Doesn't do enough.