The Vert Bog Monster

Whenever a creature dealt damage by The Vert
Bog Monster this turn dies, put a +1/+1 counter
on this creature.
For each +1/+1 counter on it, The Vert Bog
Monster gains your choice of vigilance,
deathtouch, first strike, menace, or trample.
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It eats a piece of its victims, transfusing itself with
their essence.