Kinuko, Life Unbidden

When Kinuko, Life Unbidden enters the battle-
field during a player's turn, they lose 3 life.
As long as you've gained 3 or more life this turn,
you may cast Kinuko, Life Unbidden from your
graveyard as though it had flash.
Constructs you control have lifelink.
Her steel was alive long before it was made into gears.
No one built her. They didn't need to.