Didi, the last golgari soul

Eminence — There is no limit to the number of
cards in your deck, your pile can touch the sky.
Indestructible, Infect
{p/g}{p/b}: Create a food token, add a +1/+1 counter
to other target creature.
{b}{b}{b}{g}{g}{g}: If a legendary creature died
this turn, solve a quadratic equation, if the
answer is correct, you win the game.