Dragonic Overlord, the Purge

As an additional cost, discard a card and exile
a permanent with Dragonic Overlord in
its card name.
Flying, haste, trample
When this card is cast, this card deals 4 damage
to each opponent with 8 or more life. This effect ignores protection and effects that prevent
damage and change in life totals.
At the beginning of your end step, exile this card
and put the exiled card used to pay for this cost
back into play tapped.