This is my take at an "Evol-" deck. The "Evols" consists of Fire monsters, which simulate an evolution process. The smallest stage in form of the "Evoltiles" consists entirely of Reptile monster, who try to either summon the next higher step in the food chain or generate resources via their effects. The "Evolsaurs" are all Dinosaur monsters and are the weakest member of the "Evol" group, because all of their monsters have no effect unless they enter the field via an effect of an "Evoltile" monster. This alone would not have to be a weakness, but their effects are certainly letting them down. The "Evolzars", however, are making up for that by being pretty powerful Dragon Xyz monsters which all manner of negate effects.
For the playstarters, I have "Evoltile Najasho", who summons an "Evolsaur" monster when tributed. By using "Evo-Force" on "Evoltile Najasho", you gain two Level 4 "Evolsaurs" which then can be used immediately to summon a Rank 4 Xyz monster of your choice. One copy of "Enemy Controller" is there for some cheeky plays in the opposing turn and "Evoltile Najasho" qualifies as "Double Evolution Pill" fodder since it is a Reptile and therefore a non-Dinosaur monster. "Evoltile Megachirella" generates less resources when used with "Evo-Force", but has its own effect to fetch a monster. Also, the effect of re-fueling one of your Xyz monsters is pretty insane and allows the already powerful "Evolzar Laggia" to negate even more plays the opponent tries to pull off. On the Dinosaur side of things, you have the trusty "Souleating Oviraptor", who can either fetch necessary cards or delivers graveyard setup.
On the "Evolsaur" front, I have added two "Evolsaur Cerato", since it becomes a 2100 ATK beater quite regularly while also being able to search for further "Evoltiles" when destroying monsters in battle. One "Evolsaur Diplo" gives you another option of backrow removal in the Main Deck while one "Evolsaur Vulcano" is there for potential revive plays. Further revival can be found in "Miscellaneousaurus", who also works as a protective option while in your hand. The Main Deck boss monsters in form of "Overtex Qoatlus" and "Ultimate Conductor Tyranno" are very useful in both beatdown and stun boards and are also easily summonable via "Double Evolution Pill". While "Overtex Qoatlus" potentially fetches further "Evolution Pills", they can also be searched by the copies of "Animadorned Archosaur". The "Giant Rex"/"Gold Sarcophagus" combo is simply there to give you more consistency for Xyz summons.
With "Fossil Dig", "Evo-Diversity" and "One for One" (alongside the previously mentioned "Souleating Oviraptor"), there are a few options that help you search for cards and increase the overall consistency. Some Control-/Stun-oriented options are "Lost Wind", a personal favorite of mine which lowers the ATK of Special summoned monsters and negates their effects, a few "Solemns" to disrupt the opposing plays, "Twin Twisters" for more backrow removal and two copies of "Ash Blossom & Joyous Spring" to disrupt opposing searches. "Evo-Singularity" is an absolute wonder if you have enough monsters to trigger the card and in all honesty who does not want to have multiple negates via "Evolzar Laggia" which you can then potentially refresh via "Evoltile Megachirella"?
Since the two copies of "Animadorned Archosaur" are not exactly budget-friendly, I would suggest leaving them out and instead fitting an additional copy of "Ash Blossom & Joyous Spring" and "Lost Wind" to fill the deck space if the budget is of concern.
The Extra Deck is pretty straightforward: One copy of "Evolzar Solda" (which can be summoned via "Evo-Singularity"), one of "Evolzar Dolkka" and three of "Evolzar Laggia". "Evolzar Solda" and "Evolzar Laggia" are not bad cards, but I find myself going into "Evolzar Laggia" way more often than into the other two. The rest really just consists of options for various situations: "Pentestag" can potentially kill the opponent in combination with "Ultimate Conductor Tyranno", since you can deal more piercing damage than burn, "Linkuriboh" gets rid of "Animadorned Archosaurs" that you are not able to use for summons otherwise, "Tornado Dragon" and "Knightmare Phoenix" are more backrow removal ("Tornado Dragon" with two Level 4 monsters and no further cost, while "Knightmare Phoenix" can also use "Evoltiles" or "Animadorned Archosaur" but asks for a card in your hand as additional cost), and "King of the Feral Imps" if you really need to have a "Evoltile" in hand (for example if you desperately need a non-Dinosaur monster for "Double Evolution Pill").
I personally like the theme of "Evol" and could see them being rather good with some more support. However, this current decklist is as far as I managed to get with them in deckbuilding terms. Due to generic Dinosaur support being so powerful, this deck has heavy contenders in form of "Dino Rabbit" or "True King Dinos" and I would say that both those options are probably stronger than an "Evol-"-centered build. However, if you want to give the "Evols" a spin, feel free to use this list as inspiration. Also, if you are further interested in the "Evol" group of archetypes, I would like to invite you to my blog and take a look at the archetype analysis for the "Evols" here: https://cubiccreativity.wordpress.com/2020/05/19/archetype-analysis-evol/
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