Charles R. Darwin

At the beginning of your upkeep, each player
may choose two creatures that share a creature
type. Then each player who did creates a
creature token, with this creature's power and
toughness is equal to the average of the two
chosen creatures and has the abilities of both.
Its colors are the colors of the two creatures.
Each other creature gains at the beginning of
your upkeep put a +1/-1 counter on this
creature.