Tooth Collector

#140 - Shadows over Innistrad - [SOI]
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When Tooth Collector 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.

SOI · EN Bud Cook