32 cards where (the text includes “ pile” or the text includes “guess”) and the color identity ≤ BUW and it’s legal in Commander

Fact or Fiction (Commander Masters #91)
Liliana of the Veil (Dominaria United #97)
Hostile Negotiations (The Brothers' War #105)
Make an Example (New Capenna Commander #37)
Sauron's Ransom (The Lord of the Rings: Tales of Middle-earth #225)
Jace, Architect of Thought (Commander Masters #851)
Sphinx of Uthuun (Commander Legends #406)
Unesh, Criosphinx Sovereign (Hour of Devastation #52)
Ghastly Conscription (Commander 2019 #115)
Epiphany at the Drownyard (Shadows over Innistrad #59)
Atris, Oracle of Half-Truths (Theros Beyond Death #209)
Brilliant Ultimatum (Shards of Alara #159)
Gollum, Scheming Guide (The Lord of the Rings: Tales of Middle-earth #292)
Boneyard Parley (Commander 2019 #107)
Master of Predicaments (Magic 2015 #67)
The Seventh Doctor (Doctor Who #158)
Triumph of Saint Katherine (Warhammer 40,000 Commander #17)
Sphinx of Clear Skies (Dominaria United #67)
Fortune's Favor (Eldritch Moon #61)
Do or Die (Invasion #102)
Parallel Thoughts (Scourge #44)
Intrude on the Mind (Murders at Karlov Manor #61)
Liar's Pendulum (Mirrodin #196)
The Toymaker's Trap (Doctor Who #72)
Fight or Flight (Invasion #16)
Death or Glory (Invasion #13)
Truth or Tale (Time Spiral #89)
Jeskai Infiltrator (Commander 2018 #93)
The Celestial Toymaker (Secret Lair Drop #1582)
Phyrexian Portal (Masters Edition II #217)
Mangara's Tome (Mirage #309)
Spire Phantasm (Conspiracy: Take the Crown #37)

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