The Prydwen, Steel Flagship

Flying
Whenever another nontoken artifact you control enters, create a 2/2 white Human Knight creature token with "This token gets +2/+2 as long as an artifact entered the battlefield under your control this turn."
Crew 2

Fallout

Flying
Whenever another nontoken artifact enters the battlefield under your control, create a 2/2 white Human Knight creature token with "This creature gets +2/+2 as long as an artifact entered the battlefield under your control this turn."
Crew 2

Once an artifact enters the battlefield under your control in a given turn, it doesn't matter what happens to it later. A Knight token created by The Prydwen, Steel Flagship's second ability will still get +2/+2 for the rest of that turn.