The original iteration of companions came with Ikoria: Lair of Behemoths, and on release they were placed in the sideboard and could be immediately put into play from there by paying the companion's mana cost
Super Shredder sees them go
Venat, Heart of Hydaelyn / Hydaelyn, the Mothercrystal In commander the name of the game is legendary spells, so planeswalkers and cards you already want in your white deck like Flowering of the White Tree and Caduceus, Staff of Hermes, get much better with Venat, Heart of Hydaelyn in play
Sure, it can't climb the ladder like Birthing PodBirthing Pod and Pyre of HeroesPyre of Heroes, nor can it tap the turn it comes into play like they can, but there's certainly enough upside here that this card would see a lot more play if it was opened up to either color instead of needing both
Cards like Lum Berry, Rocky Helmet, and Giant Cape offer unique strategies and buffs in battles