41 cards where the set is “ddf” and the collector number >= 39

Aether Spellbomb (Duel Decks: Elspeth vs. Tezzeret #61)
Arcbound Worker (Duel Decks: Elspeth vs. Tezzeret #40)
Argivian Restoration (Duel Decks: Elspeth vs. Tezzeret #69)
Assembly-Worker (Duel Decks: Elspeth vs. Tezzeret #45)
Clockwork Condor (Duel Decks: Elspeth vs. Tezzeret #50)
Clockwork Hydra (Duel Decks: Elspeth vs. Tezzeret #55)
Contagion Clasp (Duel Decks: Elspeth vs. Tezzeret #63)
Darksteel Citadel (Duel Decks: Elspeth vs. Tezzeret #72)
Echoing Truth (Duel Decks: Elspeth vs. Tezzeret #66)
Elixir of Immortality (Duel Decks: Elspeth vs. Tezzeret #62)
Energy Chamber (Duel Decks: Elspeth vs. Tezzeret #64)
Esperzoa (Duel Decks: Elspeth vs. Tezzeret #47)
Everflowing Chalice (Duel Decks: Elspeth vs. Tezzeret #60)
Faerie Mechanist (Duel Decks: Elspeth vs. Tezzeret #54)
Foil (Duel Decks: Elspeth vs. Tezzeret #70)
Frogmite (Duel Decks: Elspeth vs. Tezzeret #51)
Island (Duel Decks: Elspeth vs. Tezzeret #76)
Island (Duel Decks: Elspeth vs. Tezzeret #77)
Island (Duel Decks: Elspeth vs. Tezzeret #78)
Island (Duel Decks: Elspeth vs. Tezzeret #79)
Juggernaut (Duel Decks: Elspeth vs. Tezzeret #52)
Master of Etherium (Duel Decks: Elspeth vs. Tezzeret #48)
Mishra's Factory (Duel Decks: Elspeth vs. Tezzeret #73)
Moonglove Extract (Duel Decks: Elspeth vs. Tezzeret #67)
Pentavus (Duel Decks: Elspeth vs. Tezzeret #58)
Qumulox (Duel Decks: Elspeth vs. Tezzeret #59)
Razormane Masticore (Duel Decks: Elspeth vs. Tezzeret #56)
Runed Servitor (Duel Decks: Elspeth vs. Tezzeret #42)
Seat of the Synod (Duel Decks: Elspeth vs. Tezzeret #74)
Serrated Biskelion (Duel Decks: Elspeth vs. Tezzeret #46)
Silver Myr (Duel Decks: Elspeth vs. Tezzeret #43)
Stalking Stones (Duel Decks: Elspeth vs. Tezzeret #75)
Steel Overseer (Duel Decks: Elspeth vs. Tezzeret #44)
Steel Wall (Duel Decks: Elspeth vs. Tezzeret #41)
Synod Centurion (Duel Decks: Elspeth vs. Tezzeret #53)
Tezzeret the Seeker (Duel Decks: Elspeth vs. Tezzeret #39)
Thirst for Knowledge (Duel Decks: Elspeth vs. Tezzeret #68)
Thoughtcast (Duel Decks: Elspeth vs. Tezzeret #71)
Trinket Mage (Duel Decks: Elspeth vs. Tezzeret #49)
Trip Noose (Duel Decks: Elspeth vs. Tezzeret #65)
Triskelion (Duel Decks: Elspeth vs. Tezzeret #57)

Their mind whirled with grand plans, never thinking of what might happen if they got to the end of the list.