Flying
When Kokusho dies, each opponent loses 5 life. You gain life equal to the life lost this way.
Illustrated by Tsutomu Kawade · Champions of Kamigawa · #122
There are no rulings for Kokusho, the Evening Star.
When this creature enters, each opponent loses 2 life and you gain 2 life.
When this creature enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each in the mana costs of permanents you control counts toward your devotion to black.)
At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way.
Flying, protection from white
When this creature enters, each opponent loses life equal to the number of Vampires you control. You gain life equal to the life lost this way.
Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.)
When this creature enters, if it was bargained, each opponent loses 3 life and you gain 3 life.