30 cards where the set is “mps” and (the collector number >= 1 and the collector number <= 30)

Cataclysmic Gearhulk (Kaladesh Inventions #1)
Torrential Gearhulk (Kaladesh Inventions #2)
Noxious Gearhulk (Kaladesh Inventions #3)
Combustible Gearhulk (Kaladesh Inventions #4)
Verdurous Gearhulk (Kaladesh Inventions #5)
Aether Vial (Kaladesh Inventions #6)
Champion's Helm (Kaladesh Inventions #7)
Chromatic Lantern (Kaladesh Inventions #8)
Chrome Mox (Kaladesh Inventions #9)
Cloudstone Curio (Kaladesh Inventions #10)
Crucible of Worlds (Kaladesh Inventions #11)
Gauntlet of Power (Kaladesh Inventions #12)
Hangarback Walker (Kaladesh Inventions #13)
Lightning Greaves (Kaladesh Inventions #14)
Lotus Petal (Kaladesh Inventions #15)
Mana Crypt (Kaladesh Inventions #16)
Mana Vault (Kaladesh Inventions #17)
Mind's Eye (Kaladesh Inventions #18)
Mox Opal (Kaladesh Inventions #19)
Painter's Servant (Kaladesh Inventions #20)
Rings of Brighthearth (Kaladesh Inventions #21)
Scroll Rack (Kaladesh Inventions #22)
Sculpting Steel (Kaladesh Inventions #23)
Sol Ring (Kaladesh Inventions #24)
Solemn Simulacrum (Kaladesh Inventions #25)
Static Orb (Kaladesh Inventions #26)
Steel Overseer (Kaladesh Inventions #27)
Sword of Feast and Famine (Kaladesh Inventions #28)
Sword of Fire and Ice (Kaladesh Inventions #29)
Sword of Light and Shadow (Kaladesh Inventions #30)

The message was clear to Sorin—time to search for something else.