Nightmare Void
Ravnica: City of Guilds — uncommon
Sorcery
Nightmare Void rulings:
2014-02-01: If you target yourself with this spell, you must reveal your entire hand to the other players just as any other player would.
2013-06-07: Dredge lets you replace any card draw, not just the one during your draw step.
2013-06-07: 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.)
2013-06-07: You can’t use dredge unless you’re going to draw a card and the card with dredge is already in your graveyard.