Nimana Skitter-Sneak is a common Creature — Human Rogue card from Zendikar Rising (ZNR), collector number 116. Current market price: $0.08 (foil $0.08), TCGplayer market prices via Scryfall.
As long as an opponent has eight or more cards in their graveyard, this creature gets +1/+0 and has menace. (It can't be blocked except by two or more creatures.)