Captain's Duty

As an additional cost to cast Captain's Duty, sacrifice a creature with the highest power among creatures you control.
Creatures you control get +X/+X and indestructible until end of turn, where X is the sacrificed creatures power.
"As the heat subsided, through the smoke and steam,
we found the dagger, a hat, and a pile of ash." -Journal of Berryl Amaranth