31 cards where the set is “ddt” and the collector number >= 1 and the collector number < 32

Master of Waves (Duel Decks: Merfolk vs. Goblins #1)
Aquitect's Will (Duel Decks: Merfolk vs. Goblins #2)
Claustrophobia (Duel Decks: Merfolk vs. Goblins #3)
Concentrate (Duel Decks: Merfolk vs. Goblins #4)
Engulf the Shore (Duel Decks: Merfolk vs. Goblins #5)
Essence Scatter (Duel Decks: Merfolk vs. Goblins #6)
Harbinger of the Tides (Duel Decks: Merfolk vs. Goblins #7)
Inkfathom Divers (Duel Decks: Merfolk vs. Goblins #8)
Master of the Pearl Trident (Duel Decks: Merfolk vs. Goblins #9)
Merfolk Looter (Duel Decks: Merfolk vs. Goblins #10)
Merfolk Sovereign (Duel Decks: Merfolk vs. Goblins #11)
Merfolk Wayfinder (Duel Decks: Merfolk vs. Goblins #12)
Merrow Reejerey (Duel Decks: Merfolk vs. Goblins #13)
Mind Spring (Duel Decks: Merfolk vs. Goblins #14)
Misdirection (Duel Decks: Merfolk vs. Goblins #15)
Rootwater Hunter (Duel Decks: Merfolk vs. Goblins #16)
Scroll Thief (Duel Decks: Merfolk vs. Goblins #17)
Streambed Aquitects (Duel Decks: Merfolk vs. Goblins #18)
Tidal Courier (Duel Decks: Merfolk vs. Goblins #19)
Tidal Warrior (Duel Decks: Merfolk vs. Goblins #20)
Tidal Wave (Duel Decks: Merfolk vs. Goblins #21)
Tidebinder Mage (Duel Decks: Merfolk vs. Goblins #22)
Triton Tactics (Duel Decks: Merfolk vs. Goblins #23)
Wake Thrasher (Duel Decks: Merfolk vs. Goblins #24)
Cold-Eyed Selkie (Duel Decks: Merfolk vs. Goblins #25)
Blighted Cataract (Duel Decks: Merfolk vs. Goblins #26)
Lonely Sandbar (Duel Decks: Merfolk vs. Goblins #27)
Island (Duel Decks: Merfolk vs. Goblins #28)
Island (Duel Decks: Merfolk vs. Goblins #29)
Island (Duel Decks: Merfolk vs. Goblins #30)
Island (Duel Decks: Merfolk vs. Goblins #31)

Though this query has ended, its relics still slumber in New Argive.