Awoken Machine

Enchant artifact or enchantment.
Enchanted permanent is a X/5 colorless
Rust creature where X is you life total. It has
first strike, "Whenever this creature takes combat
damage, you lose that much life," and "Sacrifice
this creature: add {2} to your mana pool" in
addition to other abilities.
"Before, that machine was a useless piece of junk.
Now, it's threatening to overthrow our leader and take control of the whole planet!" -Phyrexian Followers