Greetings. For some reason, some cards are being removed from my deck when I engage in online battles. They simply disappear from my deck with no reason, but I can use them in Vs. AI mode. I noticed this because of:
1: I have 50 cards in my deck in Vs. AI and only 43 in Online mode.
2: When I activate Magician's Archive in Vs. AI I can see all cards I want to choose, but there are less cards in Online mode.
The cards I want to notify are ALL the field spell cards (Anime versions of Sogen, Yami, Mountain, Umi, Wastelands and Forest) and Soul Exchange (Anime version in black and white). For some reason, those are disappearing from my deck.

you can't use custom card on online mode, even if you try to force it you will only get a insta lose (if all your card are custom)

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Those cards are from my Custom pack. 512000XXX cannot be used online.

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Why they cannot be played? Just because they are custom? Does that make them illegal?

Why they cannot be played? Just because they are custom? Does that make them illegal?

you can only play online with card that came with the game xP
unless there a custom server with info of these card you cannot use then online, only on AI or lan mode.

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Why they cannot be played? Just because they are custom? Does that make them illegal?

no it's just because the cards don't exist on the server you can use custom cards in lan mode (and use a direct network solution like [Evolv3] or [Discord]) but make sure that your opponent has the cards as well before starting the duel.

this has all custom cards that are available to be used in lan mode.

YGOPro-Custom-Cards 

PS: if you make custom cards you can contact me to include them for you.

Aren't there any plans to host a room with "Custom Cards"? Like an option to enable them? Not many people will use them, but I just wanted to have fun with a friend and it is a pity we cannot use them.

https://discord.gg/YJHmYr4 

Aren't there any plans to host a room with "Custom Cards"? Like an option to enable them? Not many people will use them, but I just wanted to have fun with a friend and it is a pity we cannot use them.

Aren't there any plans to host a room with "Custom Cards"? Like an option to enable them? Not many people will use them, but I just wanted to have fun with a friend and it is a pity we cannot use them.

https://discord.gg/YJHmYr4