Seems like an interesting card. It's like a Mechanical Yeti that happens on Battlecry and had a huge range of randomness. You could get the Mind Blast you needed for lethal or give your opponent the UTH they needed to clear your board. So many possibilities it's hard to say if the RNG is worth the 3/4 for 3.
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You thought there would be something inspirational here didn't you?
Seems like a great way to get yourself obliterated. Putting this card in the context of this video https://www.youtube.com/watch?v=vBX-KulgJ1o reveals why I don't think anyone besides gambling junkies would ever play this card.
TLDW: A bird in the hand is worth two in the bush.
It's definitely very good in an aggro/tempo mage versus a control/midrange deck. Basically you are the one who will run out of fuel first and adding a card to your 0-2 hand will be much more impactful than adding a card to your opponent's 4-6 hand. Wouldn't feel very happy playing this against a face hunter or any other aggressive deck though.
But all competitiveness aside, I think it will be a very fun card to play with. Decent for milling.
EDIT: Apprently it is a neutral and not a mage only card. Now I love this card. :D Why should mages be the ones having all the fun. :D