1) Dragon Shields tend to be not 100% Opaque. So if the backs of your cards are identifiable, either because they are not all NM, or because you are running transform cards, that would make them identifiable, and therefore not tournament legal
2) Dragon Shield cuts can vary from box to box, so if you buy 2 boxes of dragon shields and use some sleeves from one box and some sleeves from the other in the same deck, that can also make the cards identifiable.
Assuming all your sleeves for your deck came from the same box, and the backs of your cards aren't damaged, everything should be tournament legal. I have also heard Dragon Shield's art sleeves are 100% Opaque, so that can solve issue #1, as well.
If you're curious if your sleeves are tournament legal, the best thing to do is to ask the head judge before the event starts, and they will let you know.
Dragon Shield Clear Matte
Dragon Shield Sky Blue Mattes
Dragon Shield Ivory
Was watching The Professor and he had something about the light colored Mattes not being tournament legal?
http://www.dragonshield.com/all-sleeves/matte
1) Dragon Shields tend to be not 100% Opaque. So if the backs of your cards are identifiable, either because they are not all NM, or because you are running transform cards, that would make them identifiable, and therefore not tournament legal
2) Dragon Shield cuts can vary from box to box, so if you buy 2 boxes of dragon shields and use some sleeves from one box and some sleeves from the other in the same deck, that can also make the cards identifiable.
Assuming all your sleeves for your deck came from the same box, and the backs of your cards aren't damaged, everything should be tournament legal. I have also heard Dragon Shield's art sleeves are 100% Opaque, so that can solve issue #1, as well.
If you're curious if your sleeves are tournament legal, the best thing to do is to ask the head judge before the event starts, and they will let you know.
[180 classic cube]