Centuries of Tragedy

{x}; Exile a creature you control with CMC "X".
Create a colorless artifact called "Philosopher's
Stone" with "{t}; Add X mana of any one color
to your mana pool, where X is the CMC of the
creature used to create 'Philosopher's Stone'."
Use this ability only on your turn and only
once per turn.
"A Human life is worth ONE life. No more.
No less." -Wrath