Scrapgoyf

Scrapgoyf's power and toughness is equal to the number of artifacts all graveyards.
Sacrifice a Artifact: Regenerate Scrapgoyf and put a +0/+1 or a +1/+0 counter on Scrapgoyf.
Urza's last project was not found until Teferi and Karn explored his hidden workshop when they tried to enter the mountain screeched they both quickly realized that the "mountain" was Urza's last project.