Lucius, the eternal

First strike. Reach.
When Lucius, the eternal attacks, you may pay
any amount of life. If you do, it gains +X/+0
until end of turn, where X is the amount of life
paid this way.
When Lucius the eternal dies, it deals damage
equal to its power to any target creature and
you gain that much life. If the targeted creature
dies this way, return Lucius the eternal to the
battlefield tapped at the next end step.