Rek, Scrap Giant

At the beginning of each end step, create a token
copy of target artifact that was tapped this turn.
While you control three or more copies of the
same artifact, Rek has the following abilities-
3—Rek has +3/+3
4—{u}, {t}: Counter target nonartifact spell.
5—Sacrifice three artifacts: Return an artifact
card in a graveyard to its owner's hand.
6{line}Artifact creatures you control have haste.
7{line}Artifact creatures you control have trample.