40 cards where the set is “ddk” and the collector number >= 1 and the collector number < 41

Sorin, Lord of Innistrad (Duel Decks: Sorin vs. Tibalt #1)
Doomed Traveler (Duel Decks: Sorin vs. Tibalt #2)
Vampire Lacerator (Duel Decks: Sorin vs. Tibalt #3)
Wall of Omens (Duel Decks: Sorin vs. Tibalt #4)
Child of Night (Duel Decks: Sorin vs. Tibalt #5)
Duskhunter Bat (Duel Decks: Sorin vs. Tibalt #6)
Mesmeric Fiend (Duel Decks: Sorin vs. Tibalt #7)
Gatekeeper of Malakir (Duel Decks: Sorin vs. Tibalt #8)
Twilight Drover (Duel Decks: Sorin vs. Tibalt #9)
Bloodrage Vampire (Duel Decks: Sorin vs. Tibalt #10)
Fiend Hunter (Duel Decks: Sorin vs. Tibalt #11)
Vampire Nighthawk (Duel Decks: Sorin vs. Tibalt #12)
Mausoleum Guard (Duel Decks: Sorin vs. Tibalt #13)
Phantom General (Duel Decks: Sorin vs. Tibalt #14)
Vampire Outcasts (Duel Decks: Sorin vs. Tibalt #15)
Revenant Patriarch (Duel Decks: Sorin vs. Tibalt #16)
Sengir Vampire (Duel Decks: Sorin vs. Tibalt #17)
Butcher of Malakir (Duel Decks: Sorin vs. Tibalt #18)
Vampire's Bite (Duel Decks: Sorin vs. Tibalt #19)
Decompose (Duel Decks: Sorin vs. Tibalt #20)
Sorin's Thirst (Duel Decks: Sorin vs. Tibalt #21)
Urge to Feed (Duel Decks: Sorin vs. Tibalt #22)
Zealous Persecution (Duel Decks: Sorin vs. Tibalt #23)
Lingering Souls (Duel Decks: Sorin vs. Tibalt #24)
Mortify (Duel Decks: Sorin vs. Tibalt #25)
Spectral Procession (Duel Decks: Sorin vs. Tibalt #26)
Unmake (Duel Decks: Sorin vs. Tibalt #27)
Ancient Craving (Duel Decks: Sorin vs. Tibalt #28)
Mark of the Vampire (Duel Decks: Sorin vs. Tibalt #29)
Field of Souls (Duel Decks: Sorin vs. Tibalt #30)
Absorb Vis (Duel Decks: Sorin vs. Tibalt #31)
Death Grasp (Duel Decks: Sorin vs. Tibalt #32)
Evolving Wilds (Duel Decks: Sorin vs. Tibalt #33)
Tainted Field (Duel Decks: Sorin vs. Tibalt #34)
Swamp (Duel Decks: Sorin vs. Tibalt #35)
Swamp (Duel Decks: Sorin vs. Tibalt #36)
Swamp (Duel Decks: Sorin vs. Tibalt #37)
Plains (Duel Decks: Sorin vs. Tibalt #38)
Plains (Duel Decks: Sorin vs. Tibalt #39)
Plains (Duel Decks: Sorin vs. Tibalt #40)

This search is finished. Now the real work can begin.