Rubik's Cube

{t}, tap a creature you control: put a side counter on
Rubik's Cube, then add one mana of any colour for each side counter on it.

If Rubik's Cube has 6 or more side counters on it at the beginning of your end step, shuffle it into its owner's library.



"Aargh! If only I could solve more than one damn side!"
—Iokin, Tolarian Scholar