Yes it is, and it has now been released as a Secret Rare in Stardust Overdrive.
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No, Guardian Dreadscythe has never been released as a real card, either in the TCG or OCG.
Cursebreaker is a video game-only card, there is no real card representing it.
No. The Yu-gi-oh card maker is just for fun, and not officially affiliated with Konami (the company that owns Yu-gi-oh). You can just make cards that look like it but you can not actually print it like a real yu-gi-oh card.
Mystical Guillotine is not a real Yu-Gi-Oh! card it is an anime-exclusive card; however, it does share its art with the OCG-version of Tragedy.
Are you sure that there is a card like this in Yu-Gi-Oh? Because if it isn't, then I can't answer it. Sorry. :(