Zack Fairs ability to pass on counters and Equipment at the drop of a hat makes for a playstyle that will leave your opponents guessing, and force them to play to counter your deck instead of progressing their own strategy
Focus on what your deck wants to do and determine how many creatures or spells to include based on that
That said, Stone of Erech's first ability is vastly different to Tormod's Crypt and Relic of Progenitus, which may give it the edge in certain matchups
1 The Golden Throne (Surge Foil) - $70.49 It is fitting that The Golden Throne of the Emperor of Mankind is the most valuable card from the Warhammer 40,000 Commander decks
Vivien's Grizzly is certainly costed as a common, but you can still make use of it in bear decks, or maybe with Agatha of the Vile Cauldron
If youre living with your parents and your personal belongings are limited to your bedroom, youre going to have to make do with what you have