Drakuseth, Hellkite Overlord

Flying, trample
Drakuseth Hellkite Overlord costs {x} less to cast where X is the total amount
of life your opponents have lost this turn.
When Drakuseth Hellkite Overlord attacks,
add an amount of {r} equal to the total
power of attacking dragons. You don't lose
this mana until the beginning of the next
end step.