Edit: This is the most absurdly powerful deck i have ever built. Very common to have Gitrog out T2, often with mana up for protection. Win T3.
The GitFrog Monster.. Primary goal is to get Gitrog & a discard outlet on the field with Dakmor Salvage in hand- or just Gitrog on the field and 8 cards in hand including Dakmor (this is built to be able to combo off using the cleanup step as the discard outlet, too). Slowing down for a more interactive, land recursion value building game is possible but not ideal- this deck is really just a combo engine made to combo off asap and protect everything while doing it.
For an in-depth analysis of the ridiculously complicated lines and combos in this deck, please see Leptys' very well put together primer Gitrog Dredge Combo [Primer], even if it is a bit dated by now.
The gist of it is to get Gitrog and a discard outlet on the field with Dakmor Salvage in hand (or to the graveyard somehow). At that point, I win. The combo is to discard Dakmor, putting a Gitrog draw trigger on the stack, replace the draw with Dakmor's Dredge-2 as it resolves (which creates another draw trigger if one or 2 lands are milled this way), then repeat. If Kozilek or Ulamog is milled, I'll let it shuffle, then repeat on top of draw triggers (with another land in hand, having both Kozilek & Ulamog in the deck protects against instant speed graveyard hate- if someone tries to exile all or part of my graveyard before or in response to the first shuffle trigger, I can discard the land in response and Dredge-2 before the graveyard gets exiled, then repeat until I hit the 2nd shuffle effect. The 2nd titan is also needed to ensure i hit a shuffle with the dredge-2, in case i end in an odd number & then would have the chance of not being able to dredge-2, so it would not be short-cuttable). When I have more draw triggers on the stack than there are cards in my deck, I draw my entire deck. A titan can always be discarded to eat up any extra draw triggers, if necessary. Now the "Kozi-land" combo begins. Discard a land (draw trigger), then respond to the draw trigger by discarding Kozilek/Ulamog (shuffle). The end result is going to be a draw trigger on the stack with Kozilek/Ulamog and one land in the library, & everything else in hand (see Leptys' primer). I can then discard Dakmor however many times I want to Dredge-2 each time, knowing this will result in another draw trigger as well as a shuffle trigger. I Leave the draw trigger on the stack & allow the land & titan to shuffle back into the library. In this way, I can stack however many draw triggers as I want. There is a TON of protection and interaction built into this, with different loops, but the simplest way to win would be looping Dark Ritual for infinite black mana at instant speed (I just cast it in response to the final shuffle trigger, putting it in the library along with the land & titan with 3 draw triggers ready to go), then loop Ebony Charm in the same way to win. This can be initiated with zero untapped lands by exiling Elvish Spirit Guide from hand & casting Crop Rotation- I usually use Crop Rotation to get Gaea's Cradle so I have extra green to protect with Autumn's Veil, Veil of Summer, & Heroic Intervention, then Crop Rotation again to get an untapped black mana source, then loop Dark Ritual & Ebony Charm. This loop can also be used at Sorcery speed using Lotus Petal instead of Dark Ritual. Using the Cleanup Step hand sculpt, I usually get Elvish Spirit Guide, Crop Rotation, Oblivion Crown, Veil of Summer, Autumn's Veil, Dark Ritual, & ofc Dakmor Salvage- I can then cast Dark Ritual (preferably using a mana source on board), cast Oblivion Crown onto Gitrog, then pass turn & combo off on their upkeep, with plenty of protection in hand & the ability to grab more. I do it on their upkeep because the way priority works in the Cleanup Step, as well as how mana does not carry over to additional Cleanup Steps, makes comboing off with a limited hand size extremely difficult & complicated- id rather not deal with it! Sometimes, however, I will keep a land instead of Elvish Spirit Guide in the hand sculpt if i have at least one open green mana source, in addition to the black for Dark Ritual- this is so I can restart the loop if someone responds to the draw trigger when I discard Dakmor. There are other ways to sculpt depending on the board state, & there are plenty of answers for graveyard hate, with tons of tutors & lots of extremely good targeted removal: Abrupt Decay, Assassin's Trophy, Force of Vigor, Nature's Claim, Beast Within, Krosan Grip, Reclamation Sage. There's also Toxic Deluge, & Darkblast has been surprisingly useful as well. Necropotence exile effect is a trigger that can be responded to until reaching a shuffle effect, or the entire combo can just be done on top of it, so it doesn't matter.
My favorite & most powerful deck out all my dozen or so EDH decks. This one is cEDH through & through, so finding appropriate pods can be a little challenging.
