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The mentor trigger compares the power of the involved creatures two times: at the time of the trigger, and as it resolves
I'd not pulled a single SAR from my previous two previews (Journey Together and Prismatic Evolutions), and when counting the Journey Together Products I'd purchased myself, I'm at around 200 packs with no SAR
New Creature Types in Each Set/Block Lorwyn : Noggle Magic 2010 : Siren Zendikar : Ally, Surrakar, Eldrazi Scars of Mirrodin : Hippogriff, Germ, Praetor Innistrad : Werewolf Theros : God, Sable, Lamia, Nymph Khans of Tarkir : Naga Battle for Zendikar : Scion, Processor Shadows over Innistrad : Mole Kaladesh : Aetherborn, Pilot, Servo, Monkey Amonkhet : Jackal Ixalan : Trilobite, Dinosaur Battlebond : Azra Core Set 2019 : Egg War of the Spark : Army Commander 2019 : Sculpture Throne of Eldraine : Mouse, Peasant, Warlock, Noble Theros Beyond Death : Demigod, Tentacle Ikoria: Lair of Behemoths : Otter, Shark Core Set 2021 : Dog Kaldheim : Phyrexian Strixhaven: School of Mages : Inkling, Fractal Modern Horizons 2 : Ranger, Phyrexian creature type update Dungeons & Dragons: Adventures in the Forgotten Realms : Bard, Beholder, Gnoll, Halfling, Hamster Tiefling The Lost Caverns of Ixalan : Capybara, Llama, Snail Outlaws of Thunder Junction : Armadillo, Mount, Coyote, Porcupine, Possum, Varmint Bloomburrow : Skunk, Weasel Duskmourn: House of Horror : Glimmer, Toy, Final Fantasy : Moogle, Qu, Edge of Eternities: Drix, Lobster Spider-Man : Symbiote, Villain Universes Beyond: Echidna, Hero Some creature types have also been removed over the years
That said, considering it has to be against a creature and not simply target, means you wont be getting the benefit from hitting players themselves, or opponents can simply choose not to block with one of their creatures and that means no counters, but with spells like Duel for Dominance or Ents Fury that forces Wolverine to attack an opponents creature or enchantments like Fire Whip can mitigate this restriction pretty easily
