Outside of cards from regular expansions, there are also special promo cards that can be obtained from promo packs, the in-game Shop, wonder picks, and more
Professor Fir will even have a new Learning Lab lesson ready to help players get the most out of their new Mega Greninja ex deck

Azusa's Many Journeys Baloth Prime Bountiful Harvest Bumi's Feast Lecture Courser of Kruphix Cracked Earth Technique Dredger's Insight Druid Class Dune Chanter Earth Kingdom General Eumidian Terrabotanist Gift of Paradise Glorious Sunrise Grazing Gladehart Heaped Harvest Herd Migration Jaddi Offshoot Joyous Respite Kazandu Nectarpot Lifegift Many Partings Nissa's Renewal Nissa, Nature's Artisan Orchard Strider Path to the World Tree Primeval Bounty Pulse of Murasa Retreat to Kazandu Return from the Wilds Roots of Life Sagu Wildling Sami's Curiosity Scale the Heights Silverback Elder Skola Grovedancer Sparring Dummy Spelunking Spinewoods Armadillo Spirit of the Season The Binding of the Titans Thermokarst Tireless Provisioner Titania's Command Titania, Voice of Gaea Toil to Renown Town Greeter Unlucky Cabbage Merchant Verdant Haven Wandering Stream West Wind Avatar

Even with that drawback, the whole reason shock lands are so popular is because theyre trying to imitate what the original duals do for free
While you could try to spread the poison around the table and then proliferate all your opponents at once, it also gives them more time to build their boards and team up on you