Another important aspect of deck building is synergy
#9 An Offer You Can't Refuse Set: Foundations Market Price: $2.18 Like Sheltered by Ghosts and Into the Flood Maw, An Offer You Cant Refuse answers way more problems than it should for a card that costs so little mana
Paying 10 mana to untap all your lands is a pretty dangerous ability to try and use in Standard, but in Commander you've got a lot more life to work with and can potentially leverage this effect in a lifegain deck for tons and tons of ramp
Assuming about half of those cards survived and are still in the marketplace, all of the words Ive ever written about, say, Transmute Artifact are referring to something like 3,000 total copies of the card, four of which I personally own
Of course, this last part also benefits the creatures controller, but thats the beauty of this cardit can save your creature from dying in combat while also letting you draw cards