Urborg Fireheart

When Urborg Fireheart enters the battlefield, it deals x damage to your choice of: target creature, target player, or distributed between x targets, where x is the amount of dragons you control.
Whenever damage is dealt to a dragon you control, Urborg Fireheart deals that much damage to the source of that damage. If the source was a noncreature spell, then it deals that much damage to the source's controller.