its simple, a redstone powered block that pulls 1 block each time its powered the blocks that are above of the magnet in a certain range a lot of things could be done with this because piston just push, think about when you push 2 blocks with 1 piston, how are you getting the second one back? well you could also make slimeballs placeable on blocks so they stick together, so when a sticky piston pulls it the stuck block to the block pulled by the piston would also move wouldnt it be cool? you choose which idea you like more.
My criticism is OVER 9000!! Oh, and by the way, ¡llum¡π@t¡ ©oπf¡rmed o3o
http://www.minecraft...orld-version-3/
http://www.minecraft...er-new-hudfont/