The Prestonomicon

{t}: Add two mana of any one color to your
mana pool
{x}{x}: Put {x} Sorcerer counters onto the "Prestonomicon". Remove ten Sorcerer counters spells you cast this turn gain
"you may pay {p/c}{p/c}{p/c}{p/c}{p/c} rather than pay
its mana cost". Then sacrifice the Prestonomicon.