The simplest answer to this question is that cards that are not only desired but also rare enough to warrant a higher price from lack of supply are worth the most
Bonesplitter Bonesplitter is all beatdowns all the time which means it offers a little less utility than Grafted Wargear, but at common its an option for even Pauper Cubes
Tormod is definitely the stronger of the two because black works better with the archetype and zombies have considerably more support that spirits, but you'll realistically play either one in your gravebreak deck, assuming your colors support them
It takes a full 2nd investment of five mana beyond the 1st to keep it out, so its usually a two-turn commitment
That's partially because of the amazing designs, but it's also because the pull rates feel exceptionally fair
4 | Syr Vondam, Sunstar Exemplar Mana Value: WB Type: Legendary Creature Human Knight Rarity: Rare Card Text: Vigilance, Menace