Tomonoshin will be unrestricted, and Obstruct put to 1! Check out the details on the official site.
Questions & Answers
Q2429: When I declare "Dimension Draw", I have 1 card in hand. If the opponent [Counter]s with "Obstruct", do you discard your hand when resolving "Dimension Draw"?
A: No, you will not discard. Due to "Obstruct", three cards cannot be drawn, and if you have only 1 card in hand, you cannot resolve the effect of discard two cards.