I'm not against the card's basis, but I think that something along the lines of a creature potentially gaining that much attack in one turn with only two cards - in reality, I know the quanta is an issue, but something with that kind of potential in a turn feels OP to me.
Well, with lying in mind, you could try something along the lines of a synergy with cards that will react to the opponent's cards, such as Mindgate. Maybe +1 attack every time a card owned by the opponent is stolen/mindgated/Precog'd/Cloaked/LS'd? It will open up a lot more potential combos, but it might do well to make this card either
or
if you do go with that. It'll take away the potential for high attack early in the game, but it, coupled with darkness' "Game Controlling" cards, it can be an interesting effect.
Side-note: I'm not one for RoL Hope decks either. After a month of playing them, I got really sick of them. What I'm trying to say is that just because Pinocchio isn't a rush card like
, late game it is really hard to balance. Just because the decks play two different styles - Rush & Stall - does not mean that it is not Broken. It just means that it isn't as useful if you're playing a Rush deck.
For example, take Chimera. Use it in early game, and it is near worthless. High cost, momentum, gravity pull, and a very low attack/HP, depending on the deck you're playing. Mid to Late game, it's a finisher. You get high damage and/or HP, so it acts as a meat shield or an EM creature with LS.