Lasyd Prowler is a rare Creature — Snake Ranger card from Tarkir: Dragonstorm Promos (PTDM), collector number 149p. Current market price: $0.33 (foil $0.20), TCGplayer market prices via Scryfall.
When this creature enters, you may mill cards equal to the number of lands you control. Renew — {1}{G}, Exile this card from your graveyard: Put X +1/+1 counters on target creature, where X is the number of land cards in your graveyard. Activate only as a sorcery.