i really don't see how this is different from a desynch or any other decision where the TO is required (still things that u can fake)
if i have
deck and
mark obviously the import didn't work,
i declared it to my opponent at turn 1 without even seeing his cards; by showing that screenshot to TO, i can at least try to get a rematch for that battle, using same decks (obviously the last decision goes to the TO), in the worst scenario i still get a lost, in the best i got a rematch, nothing really complicated
obviously the wrong import should be declared asap, not with 3 cards left; in most cases, u will know it because u will have a wrong mark
competitive players feel a need to exploit
pls, half of players that played war was nominated for sportmanship
http://elementscommunity.org/forum/war/war-11-sportsmanship-and-favorite-decks/, i am one of the newest guys here and i signed up in september 2015, never seen or read someone faking screenshots