It gives your opponent the chance to make mistakes, offers interesting choices to the caster, digs deep into the library for when you need a specific spell, costs only one blue mana to cast, is instant speed, guarantees three for one card advantage at worst, fills up the graveyard and just so often causes someone to scoop in favour of dividing up three or more things that beat them
Azorius has a lot of rule-setting cards, which are often done as enchantments, so we thought it was a good fit
So my argument boils down to cascade for 2 being better than cascade for 3
The Blood Rites deck is all about Vampire swarms that become far more deadly Demons after they attack
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