Having recursion is great, and though Mantle of the Ancients does a lot of heavy lifting, you need more than that
While Tetramon is clearly inspired by Pokmon , a talented modder has created a way to make the game a Pokmon store simulation
It creates a creature, it pumps up the board, and then it still gives you card advantage

Creatures (17) 1 Mother of Runes 1 Solemn Simulacrum 1 Sun Titan 1 Kurkesh, Onakke Ancient 1 Goblin Engineer 1 Zirda, the Dawnwaker 1 Bronze Guardian 1 Oswald Fiddlebender 1 Earth-Cult Elemental 1 Chaos Channeler 1 Delina, Wild Mage 1 Brazen Dwarf 1 Hoarding Ogre 1 Swarming Goblins 1 Clay Golem 1 Wyll, Blade of Frontiers 1 Caesar, Legion's Emperor Lands (39) 6 Plains 3 Swamp 7 Mountain 1 Caves of Koilos 1 Mikokoro, Center of the Sea 1 Blood Crypt 1 Exotic Orchard 1 Dragonskull Summit 1 Command Tower 1 Isolated Chapel 1 Clifftop Retreat 1 Temple of Silence 1 Temple of Triumph 1 Temple of Malice 1 Nomad Outpost 1 Smoldering Marsh 1 Needle Spires 1 Spire of Industry 1 Canyon Slough 1 Path of Ancestry 1 Arch of Orazca 1 Shineshadow Snarl 1 Haunted Ridge 1 Mount Doom 1 Restless Fortress 1 Restless Bivouac Spells (43) 1 Swords to Plowshares 1 Sol Ring 1 Terminate 1 Cranial Plating 1 Talisman of Indulgence 1 Allay 1 Nihil Spellbomb 1 Go for the Throat 1 Blasphemous Act 1 Trading Post 1 Vandalblast 1 Boros Charm 1 Krark's Other Thumb 1 Crush Contraband 1 Talisman of Conviction 1 Talisman of Hierarchy 1 Arcane Signet 1 Lithoform Engine 1 Wake the Past 1 Treasure Chest 1 Spiked Pit Trap 1 The Deck of Many Things 1 Farideh's Fireball 1 Barbarian Class 1 Ebony Fly 1 Sword of Hours 1 Revivify 1 Berserker's Frenzy 1 Wand of Wonder 1 Wyll's Reversal 1 Lae'zel's Acrobatics 1 Contraband Livestock 1 Vexing Puzzlebox 1 Kill

People are only playing early now because they live in New Zealand where the game has soft launched or, in many other cases, have used VPNs and other workarounds to spoof their location and play ahead of schedule