A command block on a minecart that can be powered using an activator rail
Note: Minify the command to avoid issues :)
Minecart Spawner
Try to place this in a dark place
Trade with him to crash your game!!!
Giant Slime and Giant Lava Slime
Big House
Spawn a new drivable car in only one command!!!!!
One Command Parkour Map Generator
Plane !!