Artifact
Convoke
(Your
creatures
can
help
cast
this
spell.
Each
creature
you
tap
while
casting
this
spell
pays
for
or
one
mana
of
that
creature's
color.)
As
this
artifact
enters,
choose
a
creature
type.
Creatures
you
control
of
the
chosen
type
get
+2/+2.
