Tooth Collector is a uncommon Creature — Human Rogue card from Shadows over Innistrad (SOI), collector number 140. Current market price: $0.11 (foil $0.25), TCGplayer market prices via Scryfall.
When this creature enters, target creature an opponent controls gets -1/-1 until end of turn. Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, target creature that player controls gets -1/-1 until end of turn.