That it can also draw extra cards at a pretty efficient clip makes it a very potent weapon for fighting removal-heavy attrition decks
Giving them a card or a creature token is much more of a cost
That said, Abrupt Decay can almost literally always be used against stuff like Lightning Greaves, Rhystic Study, Song of the Dryads or anything else thats bothering you
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Flash it in to get another instance of a great enters-the-battlefield ability (or leaves-the-battlefield, like Reveillark)
These can be cast earlier in the game if you need to, or you can pump more mana into them later on for a big payoff