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It sets them back two turns for one spell and kills something

So if you can give a creature unblockable, or go wide enough, there isn't much your opponent will be able to do

(Additionally, some of these effects are often built into tribal rewards on creatures for the tribe, such as Heron's Grace Champion being a combat trick in addition to also being a creature.) Additionally, there are cards that want your deck to have a higher overall count of a creature type to make sure they work more often

Slifer the Sky Dragon was owned by Yugi Muto, his arch-rival, so it was only natural that he holds the card in such contempt

Then, if the player gains life points during the turn, Rosemary can negate the effects of any face-up card on the field