>>617 Mirran Mettle G (c) Instant Target creature gets +2/+2 until end of turn. Metalcraft- If you control three or more artifacts, that creature gets +4/+4 until end of turn instead.
>>617 Mirrorworks 5 Artifact R Whenever another nontoken artifact enters the battlefield, you may pay 2. If you do, put a token that is a copy of that artifact onto the battlefield.