Chainweb Aracnir is a uncommon Creature — Spider card from Theros Beyond Death (THB), collector number 167. Current market price: $0.24 (foil $0.51), TCGplayer market prices via Scryfall.
Reach When this creature enters, it deals damage equal to its power to target creature with flying an opponent controls. Escape—{3}{G}{G}, Exile four other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.) This creature escapes with three +1/+1 counters on it.