I don't see anything wrong with this card. It's right where it ought to be on the curve, I think.

is the nominal cost of a card, so giving a card to your opponent justifies this costing

less than Last Word. My only objection, as silly as this may sound, is that this card is strictly better than Vex. (Note that Hinder and Cancel are
not strictly better because they have a nominally higher cost. While this also has UU in its cost, it is my understanding that UU is still considered a lower functional cost than 2U.) Yes, I realize that Vex is a terrible card. Nonetheless, it feels like it was printed recently enough that it should be allowed to stand. Perhaps, instead, you could "Skip your next draw step" as the penalty on this. That probably even makes this card a little bit better, since it doesn't change anybody's card advantage situation until as much as a full turn later.