Demon of the Sunfall

Flying.
At the beginning of your upkeep, you may pay
any amount of mana and life. Then target
opponent may pay any amount of mana and life.
If you paid one or more mana this way, create an amount of 2/1 red imp minion creature tokens
with menace and haste equal to 3 plus the mana
and life you paid minus the mana and life your opponent paid.