Phyrexian Arcfiend

Corporeal (As this spell resolves, put it into your graveyard or onto the battlefield with haste.)
As you cast this spell, choose a creature name.
If you choose to put Phyrexian Arcfiend into
your graveyard, it deals twice X damage to each
creature with the chosen name. Otherwise, it
enters the battlefield with X +1/+1 counters on
it and has "When this creature dies, it deals
damage equal to its power to each opponent."