35 cards where the card types include “island”

Breeding Pool (Ravnica Remastered #275)
Contaminated Aquifer (Dominaria United #245)
Fetid Pools (Outlaws of Thunder Junction Commander #296)
Gate to Seatower (Alchemy Horizons: Baldur's Gate #79)
Glacial Floodplain (Kaldheim #257)
Hallowed Fountain (Ravnica Remastered #280)
Hedge Maze (Murders at Karlov Manor #262)
Ice Tunnel (Kaldheim #262)
Idyllic Beachfront (Dominaria United #249)
Irrigated Farmland (Murders at Karlov Manor Commander #267)
Island (Foundations #274)
Ketria Triome (Ikoria: Lair of Behemoths #250)
Meticulous Archive (Murders at Karlov Manor #264)
Molten Tributary (Dominaria United #251)
Moonring Island (Shadowmoor #276)
Mystic Sanctuary (Murders at Karlov Manor Commander #277)
Prairie Stream (Murders at Karlov Manor Commander #281)
Raffine's Tower (Streets of New Capenna #254)
Raugrin Triome (Ikoria: Lair of Behemoths #251)
Rimewood Falls (Kaldheim #266)
Snow-Covered Island (Kaldheim #278)
Spara's Headquarters (Streets of New Capenna #257)
Steam Vents (Ravnica Remastered #288)
Sunken Hollow (Outlaws of Thunder Junction Commander #325)
Tangled Islet (Duskmourn: House of Horror Commander #306)
Thundering Falls (Murders at Karlov Manor #269)
Tropical Island (Vintage Masters #321)
Tundra (Vintage Masters #322)
Undercity Sewers (Murders at Karlov Manor #270)
Underground Sea (Vintage Masters #323)
Volatile Fjord (Kaldheim #273)
Volcanic Island (Vintage Masters #324)
Watery Grave (Ravnica Remastered #291)
Xander's Lounge (Streets of New Capenna #260)
Zagoth Triome (Ikoria: Lair of Behemoths #259)

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