Blightsteel Colossus is a mythic Artifact Creature — Phyrexian Golem card from The List (PLST), collector number 2XM-235. Current market price: $43.17, TCGplayer market prices via Scryfall.
Trample, infect, indestructible If Blightsteel Colossus would be put into a graveyard from anywhere, reveal Blightsteel Colossus and shuffle it into its owner's library instead.