The archetype also focuses on OTK'ing by manipulating ATK and using their boss monster "Geomathmech Final Sigma", although many Decks using "Mathmech" do not rely on this strategy
Building a strategy around a Pokmon is of course simpler than building something to go against all the popular decks in the format just because it will require a better, deeper understanding of the competitive scene
So you could absolutely collect Gen I, without trying to collect the unimaginably expensive Base Set in which those 151 first featured

The Hosts of Mordor Decklist Commander (1) Creatures (27) Goblin Dark-Dwellers Inferno Titan Knollspine Dragon Scourge of the Throne Siege-Gang Commander Treasure Nabber Hostage Taker Notion Thief Merciless Executioner Anger Goblin Cratermaker Guttersnipe Saruman, the White Hand Corsairs of Umbar Monstrosity of the Lake Shelob, Dread Weaver Cavern-Hoard Dragon Orcish Siegemaster Rampaging War Mammoth The Balrog of Moria Grma, Saruman's Footman Lord of the Nazgl Moria Scavenger Troll of Khazad-dm Voracious Fell Beast Grishnkh, Brash Instigator The Mouth of Sauron Instants (6) Arcane Denial Consider Fact or Fiction Forbidden Alchemy Thrill of Possibility Bitter Downfall Sorceries (16) Decree of Pain Languish Living Death Reanimate Blasphemous Act Boon of the Wish-Giver Deep Analysis Feed the Swarm Faithless Looting Extract from Darkness Subjugate the Hobbits Wake the Dragon Lidless Gaze Summons of Saruman Too Greedily, Too Deep Treason of Isengard Enchantments (4) Revenge of Ravens Shiny Impetus In the Darkness Bind Them Fiery Inscription Artifacts (8) Arcane Signet Basalt Monolith Commander's Sphere Everflowing Chalice Mind Stone Sol Ring Worn Powerstone Relic of Sauron Lands (38) Choked Estuary Desolate Lighthouse Dragonskull Summit Drowned Catacomb Foreboding Ruins Frostboil Snarl Smoldering Marsh Sulfur Falls Sulfurous Springs Sunken Hollow Underground River Command Tower Crumbling Necropolis Evolving Wilds Field of Ruin Path of Ancestry Rogue's Passage Terramorphic Expanse The Black Gate Island x6 Swamp x6 Mountain x7 Commander, Theme, and Strategy The Hosts of Mordors commander, Sauron, Lord of the Rings, lines out its two main strategies pretty well: reanimation and amass orcs

#4 What
The elf is the original mana dork that set the template for green acceleration, while the bird adds a big bonus by fixing any color and even has flying, which makes it a staple in all kinds of multicolor decks