As long as the top card of your graveyard is a creature card, Volrath's Shapeshifter has the full text of that card and has the text "{2}: Discard a card." (Volrath's Shapeshifter has that card's name, mana cost, color, types, abilities, power, and toughness.)
{2}: Discard a card.
Near Mint - $4.50
Near Mint Non-English - $4.50
Lightly Played - $4.25
Lightly Played Non-English - $4.25
Moderately Played - $3.50
Moderately Played Non-English - $3.50
Heavily Played - $2.75
Heavily Played Non-English - $2.75
Damaged - $2.25
Damaged Non-English - $2.25