Farseek (Surge Foil) [Doctor Who] Zombie Warrior then you may cast that

then you may cast that card without paying its mana cost

Volrath's Shapeshifter has the full text of that card and has the text "{2}: Discard a card

where X is the number of Cowards your opponents control

we know these happy little cards will be right at home in your collection

−2: Target creature gets +X/-X until end of turn

Farseek (Surge Foil) [Doctor Who] Zombie Warrior then you may cast thatSet: Doctor Who Type: Sorcery Rarity: Common Cost: {1}{G} Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle. "Nine cries for help, nine distress signals, all coming from the same planet." The Thirteenth Doctor