Lahoia Hound

Trample, Haste
Erode (Whenever this creature enters the battlefield and at the beginning of your upkeep,
put a - 1/-1 counter onto this creature)
Whenever one or more - 1/-1 counters are put
onto a creature you control, exile the top card of
your library. You may play cards exiled this way
until the beginning of your next end step.