It's around #14 or 15 on my list and not in the Top 10 proper, but the ability to force someone to discard, and destroy artifacts and critters with one number is a very precise scalpel that destroys what you need, but tends to leave your own stuff alone
There are a handful of effects that directly benefit you for playing Spirits, such as Battleground Geist, which gives all of your spirits +1/+0 , or Spectral Shepherd, which allows you to bounce a Spirit back to your hand to avoid death or get a second use out of its enter effect
Fear of Missing Out currently starts at $ 2.30
Like Szarekh, Anrakyr has an attack trigger, but does far more than draw you a card, instead cheating mana costs by letting the player use their life total for a single artifact spell
Open a pack and you get some cards