Asmodeus, Infernal King

Asmodeus costs {x} less to cast, where X is the
number of cards in your hand.
Whenever a creature dies, you may exile target
instant or sorcery card from a graveyard.
Whenever one or more creatures you control deal combat damage to a player, copy each card exiled
with Asmodeus. Until end of turn, you may cast
the copies, and you may spend mana as though it
were mana of any type to cast them.