32 cards where the full Oracle text includes “when” and (the full Oracle text includes “enters” or the full Oracle text includes “leaves”) and the color identity ≤ UW and (the full Oracle text includes “golem” or the card types include “golem”)

Ancestral Statue (Jumpstart #458)
Arcbound Bruiser (Darksteel #94)
Arcbound Overseer (Darksteel #99)
Arcbound Reclaimer (Darksteel #101)
Arcbound Wanderer (Modern Masters #200)
Battered Golem (Fifth Dawn #106)
Blade Splicer (March of the Machine Commander #175)
Brass Herald (Commander Legends #301)
Campus Guide (Foundations #251)
Cavalier of Dawn (Core Set 2020 #10)
Darksteel Splicer (March of the Machine Commander #13)
Dune Mover (Phyrexia: All Will Be One #226)
Glassdust Hulk (Double Masters #199)
Ichorplate Golem (Phyrexia: All Will Be One #230)
Inverted Iceberg // Iceberg Titan (The Lost Caverns of Ixalan #60)
Inverted Iceberg // Iceberg Titan (The Lost Caverns of Ixalan #60)
Iron Bully (Double Masters #262)
Malcator, Purity Overseer (Phyrexia: All Will Be One #208)
Master's Guide-Mural // Master's Manufactory (The Lost Caverns of Ixalan #233)
Master's Guide-Mural // Master's Manufactory (The Lost Caverns of Ixalan #233)
Master Splicer (March of the Machine Commander #194)
Meteor Golem (Foundations #256)
Mirror Golem (Mirrodin #208)
Oteclan Landmark // Oteclan Levitator (The Lost Caverns of Ixalan #29)
Oteclan Landmark // Oteclan Levitator (The Lost Caverns of Ixalan #29)
Pattern Matcher (Core Set 2020 #234)
Precursor Golem (Modern Masters 2015 #225)
Sensor Splicer (Double Masters 2022 #29)
Shield-Wall Sentinel (Dominaria United #238)
Solemn Simulacrum (Foundations #257)
Soultether Golem (Future Sight #164)
Sundering Titan (Double Masters #292)
Togglodyte (Unhinged #129)
Unstable Glyphbridge // Sandswirl Wanderglyph (The Lost Caverns of Ixalan #41)
Unstable Glyphbridge // Sandswirl Wanderglyph (The Lost Caverns of Ixalan #41)
Wing Splicer (Modern Masters 2017 #57)

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