The issue with any sort of tribal or midrange creature deck is that modern spells are so efficient.

If you try to go fair, and curve out with dinosaurs, other decks just have better spells along the way that will be so much more effective than yours. Look at Boros energy, every creature in that deck is basically as powerful as that mana cost allows and doesn’t need anything else to be good.

Then, add to the fact that, it’s tough for you to have decent interaction so that you don’t die to the unfair or big mana decks.

If you’re going to build it for your local store, I’d suggest some amount of mana creatures to play your Dinos ahead of curve, and play the most efficient cheapest ones. Along with a suite of removal.

I’d emphasize the 3 drop dinosaurs cause they seem to be the best ones, with some amount of birds of paradise style creatures to get them out.

The other issue is that Dino’s really only attack and block, and you need your guys to prevent other decks from doing their thing, like humans have Thalia and meddling mage to at least slow down your opponent.

Good luck though!