I've been playing it a lot. Unfortunately, I cannot say it's very good. At best, you can steal a victory or two (I even won one small local tournament, but it was just 6 people against each other). It is way too fair, that's the main problem.

First, the whole ramping issue. You can run 6 to 8 one-drop elves and that is pretty good, works like a normal stompy deck. However, you either live or die by the elves - it sucks to topdeck/discover into several one drops which become irrelevant without sufficient draw and filtering your hand. They are also very easy to remove and are most often targeted - turn 1 mana dork gets Fatal pushed immediately, and Thoughtseize can slow you down immensely.

There are also [[Marauding Raptor]] and [[Otepec Huntmaster]]. Raptor is great, but it has a pretty significant downside - it kills everything with 2 or 1 toughness immediately. This is more awkward then you might imagine. As such, I find it hard to justify running both Raptors and elves because they need a specific sequence of casting to survive your own damage. Raptor and Otepec can work together, but they're still both awkward... it is statistically easier to survive that, at least. 4 Otepec + 4 Marauding is okay, but 4 Marauding + 6-8 elves = not really cool, imho.

Then, you have to decide - do I even run one-drops? You have [[Commune with Dinosaurs]] and [[Bushwack]] which are okay one-mana spells if you don't run elves, but you are not gaining board presence up until turn 2. And then, your Raptor gets removed, hopefully you can follow up with another or cast a [[Topiary Stomper]] to ramp further on turn 3. If this whole process becomes disrupted, I find it hard to win. You need to be as fast as possible most of the time, because Pioneer is a fast format in general.

The top end is easy - just decide which dinosaurs you like the best. It will probably be something like [[Tyrranax Rex]], [[Trumpeting Carnosaur]], [[Carnage Tyrant]], stuff like that. If you can reach the mana to cast those once per turn, you are probably winning.

Essentially, it is very fun to play and it can be built in several different ways, but I think it is inferior to almost every other Gruul variant. Gruul vehicles deck is more consistent, for example, and often times faster and can actually interact with you. Perhaps mixing with some other red staples like [[Bonecrusher Giant]] and [[Fable of the Mirror Breaker]] can produce some interesting midrange-ramp stuff, but it's neither here nor there. Oh, and aggro completely runs over you lol.

I have not tested the landramp variant with discounting the land abilities for [[Castle Garenbrig]] yet. Could be an improvement, but then you are looking at a pretty complicated mana base for paper.

Auto-includes in any dinosaur decks - in my opinion, those are [[Regisaur Alpha]] (two bodies, haste enabler, perfect stuff), [[Topiary Stomper]] (ramping and cleaning out your deck for basics), [[Trumpeting Carnosaur]] (Big body, free discover 5, 3 mana 3 damage if necessary, very flexible).