Scary Monsters

Target creature becomes a Dinosaur creaure token
with power and toughness equal to target creature's,
gets a +1/+1 counter and loses all its types and
abilities.
It gains: The first time this creature deals combat
damage to another creature, that creatures also
becomes a Dinosaur creaure token with power and
toughness equal to its power and toughtness, gets a
+1/+1 counter, loses all its types and abilities and
gains this ability.