How to unlock WarioKard minigame

I looked everywhere but I can not find how to unlock the wariokard minigame in Warioware Gold for 3ds. Can someone help me?

Have you collected all the character cards? I recall you needed all those, and perhaps all the other souvenirs too.
 
You need to unlock every single souvenir. I did it by getting coins through getting all the target scores and missions.
 
this is what I see
 

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