This archetype is typically thin on removal and as such getting triggers with Kalitas is hard
A card that is only good in specific, rare situations isnt as strong as one that helps you every single game
The only downside is that you need to keep a creature alive in addition to the Enchantment in order to maintain that banishment, but Sheltered by Ghosts more than makes up for this by giving the creature in question Ward 2, for a total package that does more than other cards for less mana
[C][C][C] Big Storm: 90 damage
It would be quite important to distinguish which is which in this case
Or, for almost exactly the same price, you could buy into the top deck in LegacyTemur Delver, which currently costs $4,441and likely play it for the next 10 years without making too many changes