gitaxian probe+cabal therapy lets you clear the way and let's you know when to pull the trigger: you don't want to deck yourself and lose to your oun spells right? when your deck is in your graveyard, you cast dread return again on the flayer of the hatebound and then golgari grave-troll for lots of damage. Otherwise the 'combo' is casting dread return on balustrade spy to flip your deck into your graveyard.

from there you can even win without casting a single spell with the ichorid/nether shadow/narcomeba and bridge from below interaction with your sac outlets. You can activate phantasmagorian's ability twice while it's on the stack to discard your hand ank keeping back ideally a dredge accellerator such as gitaxian probe or street wraith. chancellor of the annex helps to mitigate the timewalk effect you give your opponent by wasting your first turn. Your goal is to go to your discard step and dump phantasmagorian or a dredger. So, the way matches play out is that we pretty much have to win game one (which we usually canManaless Dredge is one of the best game-one decks in Legacy), and then we hope that our opponent doesn't draw their sideboard hate in one post-board game.

Manaless dredge legacy how to play