This was widely seen as a mistake, even by MTG's Head Designer Mark Rosewater, and since then WotC has been much more careful when printing partner commanders, instead focusing lately on cards that can only be partners with one other specific creature
When all of these elements are considered strong individually, they can make any card overpowered when brought together
As far as tutors go, these are undiscovered gems you can pick up for a pretty reasonable cost
We need to use this maze to get to the southeast corner, where theres a staircase to B4F
Grade: C Voracious Typhon is Rampaging Baloth that draws you a Vorstclaw when it dies or is milled, so you dont have to put Vorstclaw in your deck
Dreadhorde Arcanist Dreadhorde Arcanist is a weird card to rank because its so much more powerful than most of these other zombies in the decks that support it, but its also operating on a different axis than most zombie creatures