Nightwhorl Hermit is a common Creature — Rat Rogue card from Bloomburrow (BLB), collector number 62. Current market price: $0.13 (foil $0.24), TCGplayer market prices via Scryfall.
Vigilance Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+0 and can't be blocked.