You generally don't want to cast it for less than 6 mana, at which point it's an exceptional threat
Notably, this means that players won't get to know what nonland permanent you plan to target before you choose whether to sacrifice a creature
Additionally, this knowledge will come in handy when refining your deck, as you'll be able to anticipate and counter a broader range of strategies employed by other players
Of course, colors like blue and red have more noncreature spells, while white and green have more creatures
It does not only stop an attack but it also shuffles all your opponent's attack-position monsters back into their deck
While that doesn't negate all its other abilities, it just feels weird to have this flavor word on the card that doesn't really do anything in Standard or Limited formats