The Monk archetype fits perfectly within Tifa's fighting style for MTG , letting her unleash a flurry of attacks with a second combat phase when fighting alongside a creature with 7 or more power
If Primeval Spawn would enter the battlefield and it wasnt cast or no mana was spent to cast it, exile it instead makes it so you cant Reanimate, Sneak Attack or Polymorph it into existence and this design choice feels very deliberate
A somewhat sac outlet can be nice, as is the option on variable costs
Imagine if the first ability just said, Tap: create a 2/2 token with vigilance. It still wouldnt be that good
Additionally, Sword of Feast and Famines combat damage effects are incredible
Ishkanah, Grafwidow and The Swarmweaver both rely on delirium to turn on their key abilities, while Izoni, Center of the Web needs non-land cards in the yard to exile for her collect evidence trigger