Born's Dragon

Flying
Whenever a creature token enters the battlefield
under your control, if {w} was spent to cast it, put
a +1/+1 counter on Born's Dragon.
{2}{u}{u}{u}: Born's Dragon deals X damage to any target, where X is the total number of +1/+1
counters on Born's Dragon.
"Every bolt and scale is tempered with the magic of
the forge, and every breath is a scorching reminder
that you're dealing with the might of the ancient
dragons." - Bryant Born