Zhang sengyao, the painter

At the beginning of your upkeep, create a token
that is copy of another dragon you control chosen
at random.
Whenever you cast a dragon spell, create a token
copy of that dragon, except it is an artifact and
loses all others types and abilities, it gains
"whenever a permanent with the same name as this
one leaves the battlefield, sacrifice this permanent
and return that card to the battlefield under you control".