A transforming double-faced card enters the battlefield with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or you cast it transformed, in which case it enters with its back face up
I dont expect any of these to matter in competitive Constructed formats, so they really come down to how useful they are in Draft, Sealed, and EDH
SP Engine (Energy Gain, Pok Turn, Power Spray, Cyruss Conspiracy) Great cards for SP decks, otherwise not very splashable into other decks
Often the best thing that can happen to you is that your opponent just fails to draw Be Prepared, and Whole New World can help them draw it
When I go to locals or talk to people about the game, most have some connection to the show itself