This is my first ever decklist on here, please bear with me!
We'll go up the CMC of the creatures and I'll explain their purpose to the best of my ability!
My only 2 drop Dino! It makes my creatures less and pings my creatures 2 when they enter which can trigger enrage and pumps itself +2/+0 if any but 2 of my creatures enter the battlefield? A must have for any Dinosaur deck, and goes infinite with Polyraptor
The mighty 3 drops!
Atzocan Seer, 1 of my 2 non-dinosaur creatures! more importantly then the mana dork ability (which is very important) it also brings a dinosaur back from my grave to hand. and since it's a sacrifice ability you can do this anytime, very useful when someone tries to wipe the board. And on your turn you can tap, float the mana you need, sac Atzocan Seer and get the Dino you need from your grave.
Deathgorge Scavenger, our grave hate dinosaur! While it may be weaker toughness wise if someone is playing from the grave this card is very useful, give it haste and you can trigger it twice! How nice!
Kinjalli's Sunwing, one of my few flyers but also acts as a pseudo Thalia, Heretic Cathar, while it only does creature it's still very useful, especially when other people play creatures with haste.
Ranging Raptors, my most dangerous creature, because no one ever blocks it! If it takes damage I get to grab any basic land from deck and have it enter the field tapped. A little on the slow side but ramp is ramp!
Thrashing Brontodon, a 3/4 for 3 is pretty good, but that pay sac to pop an artifact or enchantment is very useful for politics.
Wayward Swordtooth, a 5/5 for 3 that let's you play an additional land? Where's the downside? Well, it can't attack or block unless you have the City's Blessing, but I'd hardly call that a downside.
4 CMC Creatures
Forerunner of the Empire, the other non-dino creature! While not a mana dork a Tutor for any dinosaur and triggers enrage by pinging every creature for 1, not just mine put everyones, easily kills 1/1s. Playing this while Gishath, Sun's Avatar is already out on the field gives you any dinosaur you need at that moment.
Raging Regisaur, while it doesn't have any keyword, the ability to ping any target, trigger my enrage, kill a 1/1, someone is 1 damage off from death. I really like this card!
Shifting Ceratops, can't be countered? Great! Pro Blue? Useful! And with ability to pay a and give it your chois of reach, trample, or haste? Shucks, if you have enough mana you can do all 3! And it's a 5/4 wowiee!
Ripjaw Raptor, this lovely raptor has pretty good stats as a 4/5 but has the very lovely effect whenever it takes damage I draw a card, much easier to trigger then Runic Armasaurs conditional trigger I've found.
5 CMC Creatures
Raging Swordtooth, a 5/5 trampler that when it enter's pings every creature for 1, trigger's enrage and kills 1/1s on the board.
Regisaur Alpha, other Dinosaurs I control have haste is pretty nice to have, especially if I get an additional combat. Also a 3/3 Trample token is not bad too.
Temple Altisaur, a 3/4 for 5 is slightly underwhelming, but giving all my other dinosaurs pseudo indestructible is huge! Swing of block without a care! Just don't swing with this one, it potecc.
Trapjaw Tyrant, one of my favorites! A lot of my friends call it Banisher Priest on a stick. Which is weird, because Banisher is already a creature, but whatever. Have a way to ping this dino, swing at people with little blockers, or keep it as a blocker, and exile any creature without hexproof or shroud!
Quartzwood Crasher, the first new card from Ikoria! For 5 mana, you get a 6/6 with trample, in a vacuum that is good! And whenever any of my 14 creatures with trample deal damage to a player I make another X/X trample dinosaur where X is the total life they lost? This card is a house!
Zilortha, Strength Incarnate. Our. Fist. Godzilla card. ?. And what a card to start with! The card might say it's a 7/3, but in reality it's a 7/7, as is Gishath, Sun's Avatar, and makes quite a few of my other dinosaurs bigger! Love this card!
6 CMC Creatures
Carnage Tyrant, can't be countered, trample, hexproof, 7/6? Yes. Please. The standard all-star always had a home in my Dino deck.
Etali, Primal Storm, finally our first Elder Dinosaur! but it only costs 6 mana, how good could it be? what I tell people is, it's as good as you're opponent's deck! Whenever Etali, Primal Storm attacks, you exile the top card of everyones deck, you're inculuded, and just cast any nonland card for free! the cards are even cast before damage, somone exile a pump spell great! Tutor? great! Combo card? Don't cast it. Triumph of the Hordes? Delicious.
Regal Behemoth, what an amazing lizard! I mean Dinosaur! The only erratad creature I run it's that good! 5/5 trample that introduces the monarchy when it enters and lands tap for an additional mana of any color so long as you're the monarch. And you draw a card at the beginning your end step!
7 CMC Creatures
Goring Ceratops, a 3/3 for 7? That's kinda lame. Oh, it has double strike? okay so that's like 6 power, neat I guess. When it attacks all other attacking creatures I control get double strike? This card is a bomb! Gishath, Sun's Avatar for 14?
Rampaging Brontodon, what a card, I love this card as a 7/7 trampler for 7 is really fair, but when it attacks it get +1/+1 for each land you control? If you have no mana acceleration and just lands, plop this guy down, even if you miss you land for turn next turn it's swinging for 14, and if you have multiple combats it just double for each combat!
Silverclad Ferocidons, this is another of my favorites! An 8/5 for 7 is pretty strong, power wise, but when it takes damage, each opponent sacs a permanent, creatures, rocks, enchantments, walkers, lands?
Verdant Sun's Avatar, gaining life equal to their toughness is a nice plus, it helps us stay in the game! Especially in game 2 when when we get focused!
Yidaro, Wandering Monster, a bigger, better, Charging Monstrosaur. It even has a lovely cycling ability that shuffles itself back into the deck as opposed to being discarded. Gives us a draw early game, and if you happen to cycle it 4 times you get it the board! A really fun card! And the Godzilla alter is Shin Godzilla from the appropriately named film, "Shin Godzilla", aside from be being a Godzilla fan this movie is fantastic and gets a full recommendation from me!
8 CMC Creatures
Polyraptor, my first, and favorite infinite combo! I combo this with AEther Flash to create a stalemate, no winners, no losers, just a draw. I used to also play Warstorm Surge to make it a win... I might revisit it one day.
Wakening Sun's Avatar, this is a dinosaur I'd rather not cheat out, if it comes out through Gishath, Sun's Avatar, you do get a free 7/7 but that's it. No key word no activated abilities, but that cast, ETB, destroy all non-Dinosaurs can be huge, and is way more helpful then not.
Zetalpa, Primal Dawn, another Elder Dinosaur! And this one is crazy on paper and in execution! People call it "keyword soup" for good reason, what doesn't it have? Haste? Okay, sure, but that's easy enough to give it. Then what else? Skulk? Menace? ... Infect? Can't be too greedy... or can you?
9 CMC Creatures
Apex Altisaur, my only non-foil Dinosaur... oh well. This. Card. Slaps. Hard! It fights up to, let me say it again for the people in the back... UP TO one target creature you don't control, and when it takes damage you fight UP TO one more creature to fight, each time you fight, and you can stop the fighting whenever you like! That's the beauty of "up to"! Fight till it takes 9, then pass and let it heal, or have Temple Altisaur out and just wipe the board!
Titanoth Rex, this just another big Dino, an 11/11 trampler for 9 is actually pretty great all things considered! And it has cycling, but I dont think I'll ever use that ability. And our last Godzilla alter is a classic Heisei Era Godzilla, may he destroy this LGS last.
Zacama, Primal Calamity, similar to Wakening Sun's Avatar, i'd prefer to cast it, to untap all my lands as it is a cast, ETB trigger, but I'll still happily slam it down when I see it through Gishath, Sun's Avatar triggers, being able to sustain life, blow up enchantments or artifacts, even bolt creatures! It even has vigilance, reach, and trample! Let's see a Dino like this in Jurassic World 3!
The Big Kahuna is finally here! A 12/12 trampler for 12 mana!... I have never cast Ghalta, Primal Hunger for more then 2 green mana. It's that good a card, and with all the reprints it's cheap too!