Yorion was the premiere companion for 4-color Modern decks revolving around Omnath, Locus of Creation until it was banned, mostly because of the decks rising popularity, but also dexterity issues given the high amount of shuffling in a format full of fetch lands
Urza, Lord High Artificer, one of the best artifact commanders, is a blue card that loves artifacts, so you know it's broken
Tigger can quest for one, but he can gain an additional questing point if you play an action, making him work best in decks with a fair amount of singing
But this is the first shrine I want to play in every Commander game
Papalymo Totolymo* Papalymo here is an interesting spellslinger creature in WB, and would work well with a token focused deck, especially with an aristocrats theme
Its the kind of alternate wincon that isnt too easy to pull off, and will likely be exciting for the whole table if you do it