At 9 mana, this seems hard to make super good use of. It is at least worthy of the Legendary status with the insane value. Perhaps Floop or Joybuzz will make it meta in standard? Who knows with wild, it may be far too slow.
Interestingly enough this could be decent in Higherlander decks. It could give you 2 more playable copies of Zephyrus or the explorers. Assuming they aren't immediately killed. It also could have deathrattle synergy as usually with deathrattle decks something will eventually stick. The big question becomes... can we combo this with anything?
As someone who runs Zephrys decks in casual for about 7 of the 9 classes, I freaking love this card. Give him the Thaurissan discount and that's 2 extra copies of the plucky little elemental (1 for potential use next turn; 1 for a later draw - giving you more freedom to use the hand one straight away knowing that you have another copy tucked away).
Of course, as a 9 mana 5/5 that's horrible low tempo, but mmmmm more Zephrys! Of course, also works well if you have any minion out that would be worth Faceless Manipulator-ing anyway. Have a Sylvanas out? Why not a second, and one to play next turn, and one to draw later? While it's too expensive to realistically be constructed viable, it's amazingly juicy for the casual scene. :-)
Seems way too dependent on RNG or mana reduction. Sure if you draw this with Jepetto, it's nuts. otherwise you'd need bigtime mana reduction minions or spells (Luna's rings a bell). But at 9 mana, it's a tough sell IMHO.