Dalinar Kholin, the Blackthorn

When Dalinar Kholin, the Blackthorn enters
the battlefield, you may exchange control of
target artifact you control and target creature
an opponent controls.
"What is a man's life worth?" Dalinar asked softly.
"The slavemasters say one is worth about two
emerald broams," Kaladin said, frowning.
"And what do you say?"
"A life is priceless."