Is there a way to block MTG sorcery spells that view my hand?
You can interact with Thoughtseize just like any other card. In particular:


Yes, you can counter it. Use Negate, Dissolve, et cetera.

Note that this doesn't really help that much against the first-turn Thoughtseize unless you've got access to a counterspell that doesn't cost any mana, like Mental Misstep or Force of Will. The closest thing you've got in Born of the Gods Standard is Swan Song when you're on the play.

In my experience, the best answer to a first-turn Thoughtseize is to choose initial hands that won't be crippled by it. And, yeah, that's a rather big imposition. That's what makes the card so powerful.
You can invalidate its target.

Thoughtseize says "Target player reveals his or her hand." If it can't target you, it can't be cast on you. The gold standard for effects like this is Leyline of Sanctity, which is actually faster than Thoughtseize if you get it in your opening hand.

There are no such cards currently in Born of the Gods Standard. :(
You can take your best cards out of your hand.

This happens quite a lot in Legacy:


  "Thoughtseize you."
  "In response, Brainstorm."  


Then you put the cards you need most on top of your library, so they're hidden from Thoughtseize but you can draw them next turn.

There are no such cards currently in Born of the Gods Standard. :(


Thoughtseize is a powerful card (basically the best of its kind) and it's seldom easy to deal with. For higher-level strategy tips, I recommend starting with Reid Duke's excellent Thoughtseize guide &mdash; this'll help you understand what your opponent's going to be trying to do.