Creature — Human Rogue 3/2, 2B (3)

When Tooth Collector enters the battlefield, 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.

Illus. Bud Cook