6 cards penalty
it matters not whether its by a rookie mistake or otherwise
rules are there for a reason and if YOUR rookie cant take the time to double check the deck their using, then its your responsibility (whoever you are) to help them not make any mistake
we went to great length to make sure our team dont make silly mistakes like registering the wrong decks, or using the wrong numbers of cards allowed etc
it doesnt matter who win in the end, the result does not impact the rules any way
with that said, congrats 9# and thank zanz our rookie didnt make any silly mistake