Hey! I know that Minecraft isn't a game engine but I'm really good at "programming" commandblocks. So now I am searching a game engine that is like Minecraft.

And I know that this topic might be strange.

I don't know much about the "commandblocks", but ....

Here is an opensource Minecraft-like game engine (Terasology) I found several months ago :-

https://github.com/MovingBlocks/Terasology/wiki/Entity-System-Architecture

Here is a related discussion about it :-

http://forum.terasology.org/threads/block-entity-behavior.792/

If I understand you correctly it sounds like you're interested in visual scripting or visual programming, you might find something interesting with a google search for those terms.

Off the top of my head I can suggest GameMaker Studio or maybe UE4 with a focus on blueprints.

You may use UE4 or Unity(install the playmaker from the asset store) or Gamemaker. All of these engines have support for visual scripting.