Elemental Spells in Vanilla Minecraft in One Command by dudetheninja

Adds spells to your game. You get the item when starting up the mod, but if in multiplayer, new players can be given it while you're in creative using the PICK BLOCK [middle mouse button] to duplicate it.

The Fire Spell speeds you up and places fire where you were. Good for attacking quickly!

The Water Spell lets you fly up using water jets. Useful, since you can slow and drown mobs in the jets!

The Air Spell teleports you randomly away, making you temporarily invisible. Good for stealth or getting away when you need to!