more challenge difficulties

hi, i've been bashing my head against the wall trying to do the last challenge of the first set. (5:1, prize: Serum Powder)... and well, it looks like i finally got it after many many many hours but the card is not unlocking
i just beat #11 and i'm sure this is the last guy...it's the one where i have to have 1 strip mine while the AI has 5 of them. i know i did it correctly because the poison counter showed. my heart was racing as i finished it up with a felidar (and just in time as there were 0 cards in my library
) and the thing that says "you won" came up and then it said "now facing opponent #12" so i assumed that as soon as the next upkeep started, it would say that the card is unlocked as usual but it didn't!!!!
please please, if anyone knows anyway i can salvage this please let me know. i'm leaving the computer running right now. i just don't know what to do. it's the beginning of opponent #12 and i should have already got the card unlocked but it didn't. i really confused. should i keep trying to win? even though there are no conditions given? if i beat #12, will the card THEN unlock? plz plz plz help. i just spent all day getting this damn challenge and i thought i finally succeeded but this is just very very very distressing. and i'm rambling and delirious. please help. thank you.

i just beat #11 and i'm sure this is the last guy...it's the one where i have to have 1 strip mine while the AI has 5 of them. i know i did it correctly because the poison counter showed. my heart was racing as i finished it up with a felidar (and just in time as there were 0 cards in my library

please please, if anyone knows anyway i can salvage this please let me know. i'm leaving the computer running right now. i just don't know what to do. it's the beginning of opponent #12 and i should have already got the card unlocked but it didn't. i really confused. should i keep trying to win? even though there are no conditions given? if i beat #12, will the card THEN unlock? plz plz plz help. i just spent all day getting this damn challenge and i thought i finally succeeded but this is just very very very distressing. and i'm rambling and delirious. please help. thank you.