Phyresis Nanite

Living weapon, Equip—Pay 2 life. Equip only to a creature that has dealt combat damage this turn.

Equipped creature gets +1/+1 for each creature token you control.
Whenever equipped creature does combat damage to a player, create a token that's a copy of this equipment.

As long as ~ is not on the battlefield, it's a 0/0 Germ creature in addition to it's other types.