Nessian Asp is a uncommon Creature — Snake card from Conspiracy: Take the Crown (CN2), collector number 187. Current market price: $0.21 (foil $0.39), TCGplayer market prices via Scryfall.
Reach {6}{G}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)