Heeeey! This is my new plugin called InfiniteBlocks, it's simple to set up and use it. If you have idea you can post me it into comments.
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infiniteblocks.place - Allows you to place signs, that creates an block
How to use it:
It's simple! Just create an sign, with first line [InfiBlock], and second line with ID of block or item. (If you use item, you must place an some block above the item.)
Good for mineshafts, fun-servers etc.