Slinking Giant is a uncommon Creature — Giant Rogue card from Shadowmoor (SHM), collector number 106. Current market price: $0.10 (foil $0.25), TCGplayer market prices via Scryfall.
Wither (This deals damage to creatures in the form of -1/-1 counters.) Whenever this creature blocks or becomes blocked, it gets -3/-0 until end of turn.