Dredge

Dredge is the keyword attributed to the Golgari in the Ravnica block.

Description
Dredge is a recursion mechanic, where the owner of a card in a graveyard with Dredge can return the card to their hand by choosing to skip their draw and mill a number of cards. That number is written on each card with dredge. Dredge only appears on green and/or black cards with the exception of the land Dakmor Salvage from the Future Sight keyword land cycle and the card Shenanigans from Modern Horizons.

Change in reminder text
The original reminder text was ''If you would draw a card, instead you may put exactly N cards from the top of your library into your graveyard. If you do, return this card from your graveyard to your hand. Otherwise, draw a card. With the introduction of the Mill keyword in Core Set 2021'', the dredge reminder text keyword was updated to use "mill".

Rulings

 * Dredge lets you replace any card draw, not just the one during your draw step.
 * Once you decide to replace a draw using a card's dredge ability, that card can't be removed from your graveyard "in response" (replacement effects don't use the stack).
 * You can't use dredge unless you're going to draw a card and the card with dredge is already in your graveyard.

Ichorid
One of the most popular uses of dredge is to use it to quickly fill your graveyard. A famous deck based on Ichorid originated from this concept. Such decks work best with cards with high dredge values, such as Golgari Grave-Troll and Stinkweed Imp. The Extended Friggorid deck was a common deck archetype built around this mechanic. As more graveyard payoffs and discard enablers were printed, Dredge decks become mainstays of all Eternal formats - Prized Amalgam and Creeping Chill in Modern, Bridge from Below and Breakthrough</c> in Legacy, and Bazaar of Baghdad</c> and Serum Powder</c> in Vintage.

Life from the Loam
The dredge card Life from the Loam</c> has since its release found widespread tournament use fueling a wide array of decks. Life from the Loam works as an engine producing additional targets for itself when dredging. In combination with Onslaught cycling lands it is regrowable at instant speed and Onslaught fetch lands it gives color stability. It was also widely used to regrow other utility lands like Wasteland</c> and Cephalid Coliseum</c>. The card has been widely used to fuel cards requiring discard and specifically discard of lands such as Solitary Confinement</c>, Seismic Assault</c> and Retrace cards such as Raven's Crime</c>.

Trivia

 * Darkblast</c> is the only instant with dredge.