Norn, Machine Hierophant

Vigilance, Double Strike
As an additional cost, you may sacrifice any
number of creatures. This card costs {2} less for
every creature sacrificed this way.
Destroy target creature(s) for every creature you sacrificed this way.
{3}{p/w}—Convert(Target creature in opponent's
graveyard returns to the battlefield under your control.
It is a Phyrexian in addition to its other types.)
"The imperfect made chrome"