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When Prophetic Prism is legal, it usually ends up being in one deck or another, and with all of the benefits Kaladesh offers from having artifacts on the battlefield, I think you can expect to see Prophetic Prism around for the duration of its legality

Mileage on this one will vary greatly with deck composition

A lot of weird cards have a bunch of text, which Alexander calls being wordy. Playing lots of these weird, wordy cards allows you to scry more often and buff up your creatures

Otherwise, put it into your hand. Putting a card into your hand is nice, but you can literally win games by just combining Meren with Spore Frog, which you can sacrifice to prevent all combat damage for a turn - and only costs one mana