Tooth Collector

Tooth Collector
{2}{B}

Creature - Human Rogue | Power/Toughness: 3 / 2 (CMC 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.