The God Usurper

{w}All creatures you control get +x/+x.
{u}Creatures cant be blocked by creatures with converted mana cost of X or less.
{b}Destroy X amount of creatures.
{r}Do X amount of damage to any target.
{g}gain X mana of any color.
(X is the amount of mana spent to cast The God Usurper)
When The God Usurper dies shuffle it
into it's controller's graveyard.