This is mainly because of how easy it is to untap an artifact without having to follow all the stipulations laid out on Time Vault itself
While there is an embarrassment of riches at the five-spot, if we end up playing any Cloudblazers, theres nothing wrong with a one-mana draw two, gain two. Of course, we could also put Eldrazi Displacer in Spirits, though the more we go down that path, the more it pulls us away from Spirits themselves
Rowan, Scholar of Sparks and Will, Scholar of Frost isn't just one planeswalker, but two
Nezumi Graverobber If you havent played this before, consider doing so soon
This means that the typical Ajani planeswalker card isnt considered a cat, though some do have good synergy with cat cards