Trailhunter Hyjacks

For every other Hyena or Jackal creature you control, Trailhunter Hyjacks gain +1/+0.
When a Hyena or Jackal creature you control attacks, you may exert it. If you do, Trailhunter Hyjacks gains +1/+0 until end of
turn. (An exerted creature won't untap during your next untap step.)
"You don't hunt Hyjacks. They hunt you"
- Grayvan Klenn, to private Velion