48 cards where (the card types include “land” and the card types include “legendary”) and the color identity ≤ UW

Abstergo Entertainment (Assassin's Creed #79)
Academy Ruins (Double Masters #309)
Azor's Gateway // Sanctum of the Sun (Rivals of Ixalan #176)
Azor's Gateway // Sanctum of the Sun (Rivals of Ixalan #176)
Baldur's Gate (Commander Legends: Battle for Baldur's Gate #345)
Boseiju, Who Shelters All (Champions of Kamigawa #273)
Dark Depths (Dominaria Remastered #244)
Eiganjo Castle (Champions of Kamigawa #275)
Eiganjo, Seat of the Empire (Kamigawa: Neon Dynasty #268)
Eye of Ugin (Modern Masters 2015 #242)
Flagstones of Trokair (Time Spiral Remastered #278)
Gallifrey Council Chamber (Doctor Who #188)
Geier Reach Sanitarium (The Lost Caverns of Ixalan Commander #335)
Gemstone Caverns (Time Spiral Remastered #280)
Gods' Eye, Gate to the Reikai (Betrayers of Kamigawa #164)
Hall of Heliod's Generosity (Duskmourn: House of Horror Commander #283)
Hall of the Bandit Lord (Champions of Kamigawa #277)
Inventors' Fair (Kaladesh #247)
Karakas (Ultimate Masters #244)
Kor Haven (Nemesis #141)
Legion's Landing // Adanto, the First Fort (Ixalan #22)
Legion's Landing // Adanto, the First Fort (Ixalan #22)
Matzalantli, the Great Door // The Core (The Lost Caverns of Ixalan #256)
Matzalantli, the Great Door // The Core (The Lost Caverns of Ixalan #256)
Mikokoro, Center of the Sea (Dominaria United Commander #217)
Minamo, School at Water's Edge (Champions of Kamigawa #279)
Minas Tirith (The Lord of the Rings: Tales of Middle-earth #256)
Miren, the Moaning Well (Saviors of Kamigawa #163)
Nykthos, Shrine to Nyx (Theros #223)
Oboro, Palace in the Clouds (Saviors of Kamigawa #164)
Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time (The Lost Caverns of Ixalan #67)
Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time (The Lost Caverns of Ixalan #67)
Ojer Taq, Deepest Foundation // Temple of Civilization (The Lost Caverns of Ixalan #26)
Ojer Taq, Deepest Foundation // Temple of Civilization (The Lost Caverns of Ixalan #26)
Otawara, Soaring City (Kamigawa: Neon Dynasty #271)
Paliano, the High City (Conspiracy #65)
Rath's Edge (Nemesis #142)
R&D's Secret Lair (Unhinged #135)
Rivendell (The Lord of the Rings: Tales of Middle-earth #259)
Search for Azcanta // Azcanta, the Sunken Ruin (Ixalan #74)
Search for Azcanta // Azcanta, the Sunken Ruin (Ixalan #74)
Serra's Sanctum (Urza's Saga #325)
Teferi's Isle (Mirage #330)
The Everflowing Well // The Myriad Pools (The Lost Caverns of Ixalan #56)
The Everflowing Well // The Myriad Pools (The Lost Caverns of Ixalan #56)
The Grey Havens (The Lord of the Rings: Tales of Middle-earth #255)
The Tabernacle at Pendrell Vale (Masters Edition III #212)
Thousand Moons Smithy // Barracks of the Thousand (The Lost Caverns of Ixalan #39)
Thousand Moons Smithy // Barracks of the Thousand (The Lost Caverns of Ixalan #39)
Three Tree City (Bloomburrow #260)
Tolaria (Legends #308)
Tolarian Academy (Vintage Masters #319)
Trenzalore Clocktower (Doctor Who #190)
Untaidake, the Cloud Keeper (Champions of Kamigawa #285)
Urborg, Tomb of Yawgmoth (Time Spiral Remastered #287)
Yavimaya, Cradle of Growth (Modern Horizons 2 #261)

The orcs’ banner sends a clear message: “You've reached the end of this search.”