Chupacabra

Evolve (Whenever a creature enters the battlefield under
your control, if that creature has greater power or
toughness than this creature, put a +1/+1 counter on this
creature.)

it was suspected that the killings were committed by a
Satanic cult; later more killings were reported around
the island, and many farms reported loss of animal life.
Each of the animals was reported to have had its body
bled dry through a series of small circular incisions.

. [Adapt