Hypnos

Eminence: whenever a player plays a spell that player mills two
{u/b} target player mills 4
{u/b}{u/b}{u/b}{u/b} target player mills 10
{u/b}{u/b}{u/b}{u/b}{u/b}{u/b} target player mills 20
{u/b}{u/b}{u/b}{u/b}{u/b}{u/b}{u/b}{u/b}{u/b}{u/b}
target player puts their library into their graveyard