Darksteel Pendant is a common Artifact card from Darksteel (DST), collector number 113. Current market price: $0.34 (foil $1.53), TCGplayer market prices via Scryfall.
Indestructible (Effects that say "destroy" don't destroy this artifact.) {1}, {T}: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)