53 cards where the text includes “can't be blocked” and the colors ≥ B

Ukkima, Stalking Shadow (Outlaws of Thunder Junction Commander #247)
Changeling Outcast (Outlaws of Thunder Junction Commander #128)
Nightkin Ambusher (Fallout #112)
Undercover Butler (Ravnica: Clue Edition #49)
Akawalli, the Seething Tower (The Lost Caverns of Ixalan #220)
Gríma, Saruman's Footman (Tales of Middle-earth Commander #57)
Gollum, Scheming Guide (The Lord of the Rings: Tales of Middle-earth #292)
The Balrog, Durin's Bane (The Lord of the Rings: Tales of Middle-earth #195)
Troll of Khazad-dûm (The Lord of the Rings: Tales of Middle-earth #111)
Evil Eye of Orms-by-Gore (Dominaria Remastered #83)
Hexmark Destroyer (Warhammer 40,000 Commander #36)
Dauthi Horror (Commander Legends: Battle for Baldur's Gate #748)
Thieves' Tools (Commander Legends: Battle for Baldur's Gate #152)
Kamiz, Obscura Oculus (New Capenna Commander #3)
Kaito Shizuki (Kamigawa: Neon Dynasty #226)
Tatsunari, Toad Rider (Kamigawa: Neon Dynasty #123)
A-Krydle of Baldur's Gate (Adventures in the Forgotten Realms #A-226)
Krydle of Baldur's Gate (Adventures in the Forgotten Realms #226)
Sonorous Howlbonder (Ikoria: Lair of Behemoths #230)
Devourer of Memory (Theros Beyond Death #213)
Temple Thief (Theros Beyond Death #116)
Lochmere Serpent (Throne of Eldraine #195)
Duskmantle Operative (War of the Spark #88)
Bloodmist Infiltrator (Ravnica Allegiance #65)
Etrata, the Silencer (Guilds of Ravnica #170)
Chromium, the Mutable (Core Set 2019 #214)
Plague Mare (Core Set 2019 #114)
Phoebe, Head of S.N.E.A.K. (Unstable #135)
Fen Hauler (Aether Revolt #58)
Dimir Infiltrator (Planechase Anthology #86)
Tormented Soul (Planechase Anthology #38)
Elusive Tormentor // Insidious Mist (Shadows over Innistrad #108)
Elusive Tormentor // Insidious Mist (Shadows over Innistrad #108)
Sewers of Estark (Magic Online Promos #35964)
Hooded Horror (Commander 2013 #80)
Underworld Cerberus (Theros #208)
Deathcult Rogue (Gatecrash #218)
Harbor Bandit (Magic 2013 #95)
Prowling Nightstalker (Masters Edition IV #93)
Zulaport Enforcer (Rise of the Eldrazi #133)
Dread Warlock (Magic 2010 #94)
Vectis Agents (Conflux #131)
Sootwalkers (Shadowmoor #196)
Wanderbrine Rootcutters (Shadowmoor #178)
Inkfathom Infiltrator (Shadowmoor #167)
Ghastlord of Fugue (Shadowmoor #162)
Rime Transfusion (Coldsnap #68)
Vindictive Mob (Ravnica: City of Guilds #112)
Ogre Marauder (Betrayers of Kamigawa #75)
Rampart Crawler (Mercadian Masques #156)
Bog Rats (Classic Sixth Edition #117)
B.F.M. (Big Furry Monster) (Unglued #28)
Dread Charge (Portal #88)
Flow of Maggots (Ice Age #125)

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