Copper Longlegs is a common Creature — Phyrexian Spider card from Phyrexia: All Will Be One (ONE), collector number 165. Current market price: $0.25 (foil $0.30), TCGplayer market prices via Scryfall.
Reach {1}{G}, Sacrifice this creature: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)