Kha'Zix, Voidreaver

First Strike
When Kha'Zix, Voidreaver attacks, if defending
player has only one creature on the battlefield, it
must block if able.
When Kha'Zix, Voidreaver destroys a creature, it
gains its keywords (First Strike, Trample,
Vigilance, etc.) and a +1/+1 counter. If it destroys
Rengar, Pridestalker, it gains two +1/+1 counters
instead of one.