The wording on this card is pretty confusing, I hope it gets fixed.
There's nothing wrong with it though. It could be more thorough with their wording; but they've stated in a situation like this, it's expected that if you make the mistake when playing it for the first time, you'll figure out how the card works and won't run into that situation again.
If this card were intended in your situation, it'd probably say something like "Whenever you draw a card, reduce its cost by (1) when this is in your hand". If that were the case. I'd say making it "Deck" than "Hand" would be quite interesting
There's nothing wrong with it though. It could be more thorough with their wording; but they've stated in a situation like this, it's expected that if you make the mistake when playing it for the first time, you'll figure out how the card works and won't run into that situation again.
If this card were intended in your situation, it'd probably say something like "Whenever you draw a card, reduce its cost by (1) when this is in your hand". If that were the case. I'd say making it "Deck" than "Hand" would be quite interesting