Technically, the answer to this question will depend on which Commander youve picked and what colors youre playing
If you don't have Slimefoot on the battlefield, you can still threaten a win with The Mycotyrant
So if you're a Vampire fan and want a sweet Aristocrats deck but don't want to play Edgar Markov, then Blood Rites is the deck for you
The more cards you see in a game, the more likely you are to win because seeing more cards gives you more resources and options than your opponent
But you get to cast the real one later for free, so the best pattern is to play a cheap spell first and a bigger one later, like a Time Warp or Stock Up
Sadly, the non-Promo version currently only shows a value of $11.88 on TCGPlayer, but for people looking to play the game, there is no mechanical difference between the two cards