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I love that they offer three colors, can cycle late in the game, and are fetchable with three land types

For example, here are a few self-bounce cards that you can use to draw cards off this Wizard

Vnwxt, Verbose Host

While not officially serialized, Wizards did note on todays stream that there will be a little north of 200 of each of these cards

when it doesn't cost you mana or an actual card, it's likely someone will find a way to abuse it (see: Street Wraith, which probably should be banned on the principle that it violates the spirit of the "free stuff" rule, even though it never actually gets cast as a creature)