Haha, there are only a small amount of this card minted because it doesn't fit in too many decks. I haven't used it, but I'd assume that if you have 5 cards in your hand after you draw the card at the start of your turn, its cost would be set to 5, since 10 - 5 = 5. Maybe it could fit in Mill Death decks, but I haven't seen it in any match so far yet.