Rubix Cube

With this mod being the very first I attempted, it has a very small scope. If you gather 2 diamonds, 2 emeralds, 2 iron, 2 redstone, and a netherstar, you can craft the Rubix Cube and repair it with a netherstar. It does 18 damage per hit and explodes the player's location upon right-clicking a block with the item in hand.