This is happening with 3 specific cards. Grave Strength, Lord Marrowgar, and Stitched Giant. When ever I load up the deck in my collection it shows that I dont own the cards. But I do, so I take out the “not owned cards” and put in the same ones. The deck should be fixed right? Nope, It wont let me play the deck in standard or in a duel with friends. (I dont have any wild cards in it) I try restarting my game and it just takes the cards out of the deck again. I thought this would be fixed when April 11 rolled around but its still a problem. My friend can play these cards just fine.
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Delete the deck and make a new one. For the vast majority of players this works just fine.
Simply fiddling with your decks doesn’t do it. You have to just delete it and make a new one [copying it before deleting it works too].
That seems to have fixed it. Thank you for your tip! 
