Instant effect
Steal Buff
Steal Buff is the game's own name for this effect on the battle screen. The game gives no separate description for it.
Champions with it
99 champions have a skill with a Steal Buff effect, according to the effect lines in the game data. This lists who has it and on which skill, not how strong it is or how often it happens: values and chances are on each champion's page.
Abbess Arrow of Rebuke
Ailil Gnarled Scythe
Alaric the Hooded Demand Chivalry
Amoch the First Satrap Satrap's Secrets
Anointed Vigor Theft
Aothar Rage
April O'Neil Explosive Scoop
Arashi the Riptide Concealed Blades
Archbishop Pinthroy Author of Fates
Aria the Golden Hope Avatar Of Victory
Arwydd Quivergrass Grasscutter
Baerd the Broad Thieving Axeman
Basileus Roanas Bolts of Scorn
Basim Ibn Ishaq Masterful Thief [P]
Belz the Reckoner Gift of Pain
Candleguard Light of Scrutiny
Chronicler Adelyn Equivalent Exchange
Dorothy Gale Furious Tornado
Dune Herald Zaharis The Herald Speaks
Edward Kenway Fan The Hammer
Elder Skarg Hunt the Marked
Eolfrig Flow of Morale
Errol Negation
Esme the Dancer Blessing of the Sands (all enemies)
Ezio Auditore Hidden Gun
Falmond Mournsword Burning Courage
Fodbor the Bard Robber's Tale
Frolni the Mechanist Bloody Larceny
Gamuran Thief of Blood
Genbo the Dishonored Twin Soulswords
Geomancer Creeping Petrify
Gliseah Soulguide Breath of Rime
Gomlok Skyhide Fateful Trickster
Greathoof Loriaca Deprive
Greenwarden Ruarc Rust Consume You
Gwyndolin the Silent Plumedart
Haggibah the Nestmaid Larval Consumption (all enemies)
Harvest Jack Harvest of Fear
Hellfreak Mind Games
Hilda Arnorndottr Ax Pirouette
Hilvi the Rime-called Divine Mission [P]
Honor Guard Fate Transfer
Ilysinya Lancer
Kantra the Cyclone Bane Hatchet
Karnage the Anarch Devilish Accord
Knave of Hearts Gallant Knave
Konstantin the Dayborn Quietude
Kurosa the Covetous Icon of Havoc (all enemies)
Lightward Siendra Luminant Strike
Locwain Booncatcher
Loki the Deceiver Bandit Flash
Ma'Shalled Open Wounds
Mad Hatter Dastardly Distillation
Madame Serris Tricks and Treats
Maddak, Eyes of Skyiron Scattershot Barrage
Malkith Bloodflock Deathplume
Masamoto Dual Slice
Metalshaper Transference Bolt
Mighty Ukko Totem Warden [P]
Morrigaine Shriek of the Banshee
Mystic Hand Turn the Tide
Nari the Lucky Joyful Song [P]; Wee Filcher
Nell Blackteeth Soporific Musk (all enemies)
Nogoryo Abduct By Night
Oboro Mystic Smoke
Odin Faefather Asgardian Judgment
Ogryn Jailer Confiscate
Orynyx Mindcrawler Clinging Webstorm
Pelops the Victor Gorgoa's Bane
Peydma Appropriate
Phranox Isolate
Primus Atalact Duty Until Death [P]
Rhaia the Mourned Discordant Fury
Romero Succor (all enemies)
Sabrael the Distant Perfection In Motion
Samar Gemcursed Boon Subversion (all enemies)
Shamrock Luck Swap
Shredder This Is True Ninjutsu!
Skartorsis Hand of Doom
Skathix Transfer Rush
Skeletor Begone, Fools! (all enemies)
Slitherbrute Essence Snatch
Snorting Thug Dire Defense; Ruckus; Wanton Mugging
Solanar the Gleaming Unfettered Radiance
Sun Wukong Now You See Us (all enemies)
Swarmspeaker Zyclic Chitin Cutter
Tatsu Purgation Blade
Teela Goremane Hexdrinker Scimitar
Temptress Sly Slice
Theodosia the Disgraced Baleful Onslaught (all enemies)
Tomoe Stab and Grab
Tormin the Cold Iceberg Crush
Torturehelm Pillage
Ugir the Wyrmeater Wyrmwrath
Valkanen Malice Unleashed
Vestele Riverthorn Raging River
Warcaster Tactical Ace
Warchief Marauder
Weregren Suncursed Bestial Leap
Taken from the game data and not tested in battle here. See Data quality.