Obelisk Spider is a uncommon Creature — Spider card from The List (PLST), collector number HOU-141. Current market price: $4.42, TCGplayer market prices via Scryfall.
Reach Whenever this creature deals combat damage to a creature, put a -1/-1 counter on that creature. Whenever you put one or more -1/-1 counters on a creature, each opponent loses 1 life and you gain 1 life.