In gameplay terms, Magikarp is not much to get excited about

Advanced Search Sets Random Syntax Acolyte of Aclazotz Anchovy & Banana Pizza Arbiter of Woe Ayara, First of Locthwain Ayara, Widow of the Realm Bake into a Pie Blight Keeper Blood Host Blood-Chin Fanatic Bontu the Glorified Bushmeat Poacher Canyon Crawler Cauldron Familiar Chainer's Torment Cirith Ungol Patrol Clackbridge Troll Death Cultist Dimension X Pizzasaur Disciple of Bolas Disciple of Griselbrand Dreg Recycler Dubious Delicacy Entropic Eidolon Essence Feed Experimental Confectioner Feed the Cauldron Fell Beast of Mordor Giant's Skewer Gibbering Barricade Gingerbread Hunter Glass-Cast Heart Gluttonous Guest Gnawing Zombie Greed's Gambit Grisly Sigil Grma Wormtongue Gutless Ghoul High Fae Negotiator Kamber, the Plunderer Kheru Bloodsucker Kheru Dreadmaw Lamentation Lampad of Death's Vigil Mintstrosity Momentum Breaker Moonstone Eulogist Nocturnal Hunger Ob Nixilis of the Black Oath Old Flitterfang Origin of Black Widow Plunge into Darkness Popular Egotist Qarsi Sadist Questionable Cuisine Raven Eagle Reckoner's Bargain Rite of Consumption Savor Scream Puff Sephiroth, Fabled SOLDIER Sephiroth, One-Winged Angel Severed Strands Shelob's Ambush Sling-Gang Lieutenant Sorin, Imperious Bloodlord Spark Reaper Sweettooth Witch Tempting Witch Thallid Omnivore The Witch's Vanity Titan Hunter Tymaret Calls the Dead

Special sets are smaller than standard sets but they often have a stronger theme and narrative pull
Also Fusion Chants, they vary based on the monsters used in the fusion
And let's be honest: what green deck isn't running a ton of creatures
But that's not how things have to work here in your deck