@dd this remind me mindslaver :p
I agree the cost should be higher maybe not 8//7 but at least 6//5 or 7//6 because this card can make you win a game you'd ahve normally loose. I like the idea
It's Word of Command, not Mindslaver
But yeah, putting it on par with a card like Parallel Universe in cost is probably reasonable. People play that card even though most of the creatures they are copying cost less than parallel universe itself. The one key difference is that this card also gives you card advantage in that it deprives the opponent of that card from their hand as well. Imagine snagging their Miracle right before they want to use it, for instance, or Shard of Sacrifice, or some other key card.