Kha'Zix, Voidreaver

Devoid (This card has no color.)
Evolve
Whenever Kha'Zix, Voidreaver is dealt combat
damage, you may pay {2}{c}. Regenerate and
evolve Kha'Zix, Voidreaver.
Whenever a creature causes Kha'Zix, Voidreaver
to evolve, it may gain an activated or keyword
ability of that creature.