Challenge 3 #8 deck legality

[takijeden]

So no matter if i check Vintage filter on while building my deck, the game always gives me a loss at the start of the gauntlet, meaning my deck is not Vintage legal. I checked it multiple times, made multiple changes, even set all lands as basics, but nothing helps. I'd really love to unlock Bloodbraid Elf...
Can anyone help me?

My decklist:
4 Birds of Paradise
4 Coiling Oracle
4 Kodama's Reach
4 Natural Order
4 Bribery
4 Summoning Trap
4 Platinum Angel
4 Craterhoof Behemoth
4 Artisan of Kozilek
4 Kozilek, Butcher of Truth
Ehh, nevermind, somehow after posting this the deck got accepted...
And now it rejects the deck again. What's wrong?

[Korath]

You do have at least 60 cards, right? (Since you didn't show your lands.)

The only other thing I can think of is that trying to run different challenges without exiting the game entirely first. There's a specific warning to do this for the puzzle challenge, but you've really got to do it for all of them.