Visions of Beyond

• WWizards of the Coast2018-12-07
  Official Ruling
  You determine whether you'll draw one or three cards as Visions of Beyond begins to resolve. This means that if you have nineteen cards in your graveyard and use a dredge ability to replace the one card draw, you won't draw two more cards after that even though your graveyard now has twenty cards in it.

Rulings via Scryfall