9/29/2016 - Countermagic week continues.
"How much is that spell worth to you?"
If we both choose 0, the spell is countered and no one draws.
If you cast this on me and choose 1 while I choose 0, my spell is countered, but I draw a card. If you choose 2 (and I choose 0 or 1), I get two cards.
If you cast this on me and choose 0, while I choose 1, my spell resolves, but you draw a card. If I choose 2 (and you choose 0 or 1), you get two cards.
But if we both choose 1, the spell is countered and I draw a card.
So I imagine the most common choices are 1 or 2 for you and 1 or 0 for me, depending on the relevance of the spell. Which, as with all good guessing games, gives a norm for players to deviate from and bluff around.