Tooth Collector is a uncommon Creature — Human Rogue card from Duel Decks: Blessed vs. Cursed (DDQ), collector number 64. Current market price: $0.05, 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.