Vintage Dredge players get to do this by relying on the effect of Serum Powder and aggressive mulliganing to improve their odds of starting the game with at least one copy of Bazaar of Baghdad, which simultaneously does both things a Dredge player needs to do to accelerate their gamestate, it draws cards and lets you selectively discard.

In fact, many Vintage Dredge pilots opt for builds that do not even run a single mana producing land (except maybe their own Wasteland or Strip Mine). In a format in which most archetypes rely heavily on using cards like Force of Will, Wasteland, Strip Mine, Thorn of Amethyst, and other forms of countermagic, disruption or taxing effects to slow their opponents while they setup their own win, Dredge can close out a game in a matter of minutes without ever using any mana and in some cases without casting any spells. When it comes to the Vintage format, very few archetypes have ever been as frightening to players as Dredge.

Ahh, Vintage Dredge – bringing a shovel to a knife fight.

Mtg manaless dredge bazaar of bagdad