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
Complexity: Possibly the simplest deck in the format with concise text, vanilla monsters, and no combos at all
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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
If you revealed "Gunkan Suship Shari" in your hand at activation, you can choose the card to add to your hand, instead of your opponent choosing