Without cards like this you don't have nearly enough disposable goblins to make your sac outlets perform
Although Pokmons satisfying loop of sending out Pokmon, evolving them and executing their most powerful moves has remained basically the same, later sets have introduced awesome additions like tag teams, which include two Pokmon on a single card so you can see how Pikachu and Zarude would fare against Eevee and Corviknight
Roughly 40% of flyers cant block her, and the others almost unanimously die to her
The counter adding plays into proliferate and leaders in Simic that care about counters
Just having that trigger a single time is worth the cost a of 1-mana enchantment, and anything beyond that is insane value
Not only can these spells be cast on the same turn cycle that you jam Katara, but they also help protect her from any removal spells your opponent has at the ready