Confounding Codevault

Supremacy — At the beginning of your end step,
if you've cast a creature and noncreature spell this
turn, put an unlock counter on Confounding
Codevault.

{2}{u}, Sacrifice: Confounding Codevault: Draw two
cards. If there were three or more unlock counters
on Confounding Codevault, instead draw four cards.

"With the codevaults, Dormu turned the world's
greatest minds into servants of his machinations."