Deck Name: Manaless Ichorid
Magic Format: Legacy (semi-competitive, circa 2011)
Insight: Arguably one of the strangest archetypes to find a home in the zeitgeist as a serious tournament deck. Lands? Don't need them. Mana? Don't need it. Casting spells from your hand? Not worth it. Casting spells at all? Eh, take it or leave it. Play or draw? Draw please, except actually, I won't be drawing a single card after my first turn of the game. Opponent has creatures? Better not kill them! There's a perception that Dredge decks in general operate in a kind of upside-down world, and Manaless variants even moreso. So much could be said about the weirdness of this sort of deck. Perhaps most notably, yes, you can potentially win a game without ever casting a single spell, although the Flashback mechanic does allow this deck to cast Cabal Therapy and Dread Return from the graveyard. The idea is to be on the draw and discard down to 7, getting a Dredge card into your graveyard so that you can keep dumping your library into your graveyard, replacing every card draw with Dredge triggers. Street Wraith in the opening hand can allow for extra Dredge triggers. Phantasmagorian can put dredgers back into your graveyard. Through the course of the game, Gigapede, Narcomoeba, Nether Shadow, and, most importantly, Ichorid can all wind up on the battlefield through their own abilities, and when they die, Bridge from Below makes zombies. Although this build needs to use Cabal Therapy and Dread Return to really get enough zombies to be explosive enough to be competitive, in principle it is possible to win against some opponents without casting any spells at all.
Tournament usage note: Psarketos pointed out that it is of interest that this deck took down a large tournament (Star City Games Open in Cincinnati in July of 2011). Technically, the deck took 2nd place because the pilot conceded in order to boost the other finalist's standing for future tournaments, but it essentially won the whole thing. Pretty cool. The Legacy metagame at the time was in a strange spot, as this was near the end of the infamous "Mental Misstep era." Some players correctly read the environment as being soft to graveyard-based decks and ported the Manaless Ichorid deck from the MTGO Classic format to Legacy. This kind of deck basically folds to graveyard hate, but is robust against nearly all other types of sideboard countermeasures. Counterspells don't help much, because Cabal Therapy can pick them off and even if Dread Return does get countered, it is still probably making several zombies due to Bridge triggers.
Deck List (01/13/2018):
4 Street Wraith
4 Cabal Therapy
4 Phantasmagorian
3 Gigapede
4 Golgari Grave-Troll
4 Stinkweed Imp
4 Golgari Thug
4 Shambling Shell
3 Dakmor Salvage
4 Narcomoeba
4 Bloodghast
4 Ichorid
4 Nether Shadow
4 Bridge from Below
4 Dread Return
1 Woodfall Primus
1 Iona, Shield of Emeria