Best BlockReset plugin for Spigot 1.8.x+.
After a player places a block, it will change into other blocks in stages by the time (stages are customizable) and then break.
To compile the source code use the command:
./gradlew install
or
gradlew.bat install
in the folder with the code.
If you have any questions, you can contact me in Discord: rapust
The plugin page on spigotmc: https://www.spigotmc.org/resources/blockreset.105192/