Thran Spider is a rare Artifact Creature — Spider card from The Brothers' War Promos (PBRO), collector number 254p. Current market price: $0.32 (foil $0.63), TCGplayer market prices via Scryfall.
Reach When this creature enters, you and target opponent each create a tapped Powerstone token. {7}: Look at the top four cards of your library. You may reveal an artifact card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.