Outlaws of Thunder Junction

Bovine Intervention | Instant | | Destroy target artifact or creature. Its controller creates a 2/2 white Ox creature token. | Julia Metzger

Frontier Seeker | Creature | Human Scout | When Frontier Seeker enters the battlefield, look at the top five cards of your library. You may reveal a Mount creature card or a Plains card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. | Raluca Marinescu

Omenport Vigilante | Creature | Human Mercenary | Omenport Vigilante has double strike as long as you've committed a crime this turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.) | Forrest Imel

Prairie Dog | Creature | Squirrel | Lifelink At the beginning of your end step, if you haven't cast a spell from your hand this turn, put a +1/+1 counter on Prairie Dog. {4}{W}: Until end of turn, if you would put one or more +1/+1 counters on a creature you control, put that many plus one +1/+1 counters on it instead. | Kevin Sidharta

Form a Posse | Sorcery | | Create X 1/1 red Mercenary creature tokens with "{T}: Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery." | J.Lonnee

Miriam, Herd Whisperer | Legendary Creature | Human Druid | As long as it's your turn, Mounts and Vehicles you control have hexproof. Whenever a Mount or Vehicle you control attacks, put a +1/+1 counter on it. | Viko Menezes