March of the Machines

At the beginning of your upkeep, create a Black
and Red 2/1 Machine Lifeform artifact creature
token with Menace.
Sacrifice two artifacts: Search your library for an Equipment spell, reveal it, and put it into your
hand, then shuffle your library.
Created ages ago by the invading aliens, the machines
have observed the lives of the humans that they've
wiped out, even to the point where they've gained sentience.