Kha’ zix, the hunter

Deathtouch, first strike
Whenever a legendary creature enters the battlefield Kha zix fights target creature
Linger 3 - {2}{b} (you may cast this card for its
linger cost and exile it with 3 time counters on it.
At the beginning of your upkeep remove a time counter from this permanent. If there are no
time counters on Kha zix, put it onto the battlefield)