Krec, Slick Salvager

Double Strike, Vigilance
Metalcraft—At the beginning of each player's
upkeep you may choose an artifact card in that
player's graveyard and return it to play under
their control as long as you control three or more artifacts.
Krec gets +X/+0 where X is the number of
artifacts on the battlefield
Shinny, pretty, pointy things are my favorites