For these decks, the opportunity of playing Jegantha, the Wellspring is just too high, not because of the number of cards they can't play, but because of the power-level of the small number of cards that don't meet Jegantha, the Wellspring companion restriction
In total, the reprints in The Last of Us Part I are worth $18, most of which is thanks to Cabal Ritual
For reference, this cards original printing was in the Strixhaven Commander deck for Osgir, the Reconstructor, who can make multiple copies of this that can be sacrificed when necessary for a brand new hand of seven cards
It gives a similar sense to what companion was going for (giving you a sort of pet in the command zone aside from your commander proper) without utterly breaking the game
A good example is Obeka, Splitter of Secondss ability to add extra upkeep steps
And in Commander, all opponents can have a lot of unused mana, including your opponent