Sedna, Zeren's Hunter

First Strike, Haste, Cosmic

Whenever you trigger a Cosmic dice roll,
target creature loses flying until your next turn.
Whenever an opponent casts a black creature spell
you may roll a d3. You may gain life equal to the number you roll.

"I, Sedna, descendant of the great, will use all my strength until the end to take the life of the white-haired one of the cult."