Jackal Sniper

Exert — When Jackal Sniper attacks, you
may choose to exert it. If you do, Jackal
Sniper gains +4/0 and does not untap during it's controller's next untap phase.
"Jackals may be superior marksmen and they're very sneaky, but that doesn't make them excellent snipers.
They’re a little too bloodthirsty for that."