I think it would be interesting to specialize in this ability, but in this list, I have kept it to just gaining advantage through loose synergies
The included Lapras ex and Cinderace ex cards are both similarly Stellar Tera cards , presumably " new alternate art versions from Japan's upcoming Terastal Festival set ," according to PokBeach

Alpine Grizzly Ashcoat Bear Ayula, Queen Among Bears Balduvian Bears Bear Cub Bosco, Just a Bear Copper Host Crusher Diregraf Scavenger Doc Aurlock, Grizzled Genius Dragon-Scarred Bear Drover Grizzly Druid's Familiar Duskana, the Rage Mother Evercoat Ursine Exuberant Wolfbear Fiendish Panda Forest Bear Friendly Teddy Golden Bear Goreclaw, Terror of Qal Sisma Grizzly Bears Grizzly Ghoul Hei Bai, Forest Guardian Hei Bai, Spirit of Balance Hurska Sweet-Tooth Koala-Sheep Kudo, King Among Bears Lumra, Bellow of the Woods Mother Bear Owlbear Owlbear Cub Pale Bears Phantasmal Bear Platypus-Bear Professor of Zoomancy Rampaging Yao Guai Razorclaw Bear River Bear Runeclaw Bear Ruxa, Patient Professor Spectral Bears Spirit of the Aldergard Striped Bears Studious First-Year Surrak and Goreclaw Ulvenwald Bear Ursine Fylgja Ursine Monstrosity Vastlands Scavenger Vivien's Grizzly Werebear Wilson, Refined Grizzly

(Cursed, Young, and Virtuous are slightly different, with Cursed being the most different as being a negative.) Creatures can only have one Role from a given player at a time
(Treachery is best played with Commander/EDH: see mtgcommander.net for more informations about this format.) However, due to the increased political nature of Treachery, and the fact that all the players start the game being opponents to each other, some cards should not be played without prior agreement from the other players in the game, and may steer your playgroup to avoid other, similar cards
Enchanting Reprints Besides the main set there are some absolutely great reprints in the Enchanted Tales bonus sheet in this set