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All of this disrupts the opposing player from playing their cards how they want to
Being able to ramp the best land out of the top four cards of your deck at instant speed is already very useful, but the fact that you can still draw one of them into your hand as a fall back means that you wont have a major downside (see Growth Spiral for a similar effect)
While this isnt as good in the late game as something like Coat of Arms, its much better early on, and you dont need to have an army to make them all big and scary
A few of the cards fit seamlessly into established decks, while others may help you develop a new strategy
Now, one of your opponents can decide which one of those cards you get to keep, but if your deck boasts some redundancy, it will always be a win-win for you, right