Sachi, Daughter of Seshiro is a uncommon Legendary Creature — Snake Shaman card from Champions of Kamigawa (CHK), collector number 238. Current market price: $0.54 (foil $4.17), TCGplayer market prices via Scryfall.
Other Snake creatures you control get +0/+1. Shamans you control have "{T}: Add {G}{G}."