Regurgitant

Ingest, ingest (Whenever this creature deals combat
damage to a player, that player exiles the top card of
their library.)
{c}: Exile another target creature you control.
{x}{b}, {t}: Put a creature card exiled with
Regurgitant into its owner's graveyard: Target creature gets -X/-X until end of turn, where
X is that card's mana value.