Questing Beast manages to have an even more impressive range of abilities than Gargaroth with evasion, haste, defensive capability, and the ability the smack a planeswalker and a player at once
Im not listing these because I think we should play them, I just wanted to share my suspicion that Tarkir is the world thats going to get devastated by the Eldrazi at some point to later turn into Zendikar, what with the references to Ugin and the hints at future colorless matters cards in parallel to Eye of Ugin in Worldwake
Although it comes with a relatively high base cost, Hunter's Mark can be used extremely cheaply against opponents playing Blue cards (ignoring their inevitable counter-spells, too), and to potentially devastating effect against Blue planeswalkers it's a tempting sideboard card
With first strike, vigilance, and trample, its clearly raring for a good fight