Darkblast

Instant    (CMC:1)

Target creature gets -1/-1 until end of turn. Dredge 3 (If you would draw a card, instead you may put exactly three 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.)

Golgari

82 RAV • ENRandy Gallegos

™ & © 1993—2005 Wizards of the Coast

Legal in: Modern,Ravnica Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Darkblast {B} Instant Target creature gets -1/-1 until end of turn. Dredge 3 (If you would draw a card, instead you may put exactly three 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.)

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View this MTG card on Gatherer

6/7/2013
Dredge lets you replace any card draw, not just the one during your draw step.
6/7/2013
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.)
6/7/2013
You can't use dredge unless you're going to draw a card and the card with dredge is already in your graveyard.

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