Demi-Fiend, Lucifer's Rage

Lifelink, Vigilance
When Demi-Fiend, Lucifer's Rage enters the
battlefield, it is indestructible until your next
turn.
{x}: When blocking with Demi-Fiend, Lucifer's
Rage, you may pay X where X is equal to half
of the attacking creatures power rounded up.
Prevent combat damage from the attacking
creature. Gain life equal to attacking creature's
power.