Magma Crawler

Menace
Magma Crawler's power is equal to the number
of artifacts you control.
When Magma Crawler enters the battlefield,
Find 6. (Exile the top six cards of your
library face-up, then create a colorless Scrap artifact
token for each land card exiled this way. Scrap tokens
have "Exile this artifact: Add one mana of
any color".)