Nightmare Void
Sorcery
Target player reveals their hand. You choose a card from it. That player discards that card.
Dredge 2 (If you would draw a card, instead you may put exactly two 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.)
Illustrated by
Ravnica: City of Guilds#100UncommonEnglishLegality
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.
If you target yourself with this spell, you must reveal your entire hand to the other players just as any other player would.