There isn't any book that has a Myconid as a playable race. You can use the homebrew creator without buying any particular book. The main reason to buy anything is if you know of a race that's got similar features that you'd like to copy, since you can use that race as a template. Since I don't know what you're trying to do, I can't suggest any - but it's not necessary anyway.
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If you're not willing or able to to discuss in good faith, then don't be surprised if I don't respond, there are better things in life for me to do than humour you. This signature is that response.
I have an idea to build a Myconid character. What book, if any, do I need to buy in order to build this using DnDBeyond?
There isn't any book that has a Myconid as a playable race. You can use the homebrew creator without buying any particular book. The main reason to buy anything is if you know of a race that's got similar features that you'd like to copy, since you can use that race as a template. Since I don't know what you're trying to do, I can't suggest any - but it's not necessary anyway.
If you're not willing or able to to discuss in good faith, then don't be surprised if I don't respond, there are better things in life for me to do than humour you. This signature is that response.
There's no playable Myconid race in any of the books.
do we know when there will be a option to make a myconid charactersheet in dnd beyond?!?!
Potentially when the book the Underdark UA is for comes out. No specific timeline yet, though