Quick question. Is it preferable for each player to use their own damage deck or should both players share a single deck?

Personally I feel it should be a shared deck, adds to the random element of what critical comes next. I know it's probably not common but it would also remove any question of stacking the deck.

What are tournament rules on this?

Eveyone brings their own deck.

Decks are a set amount of 33 cards randomly ordered. 7 direct hits, 2 of everything else. For balance you want both players with the same odds of drawing the same crit.

Standard games you can share a deck, but I'd say that the vast majority of people have their own deck and it's easier to use your own.

But in tournaments you each are supposed to bring your own deck.