The vast majority of the good card-drawers do not require you to pay more than 2 mana per card you net

Creatures (24) 1 Solemn Simulacrum 1 Mulldrifter 1 Soulbright Flamekin 1 Architects of Will 1 Reassembling Skeleton 1 Grave Titan 1 Nin, the Pain Artist 1 Azure Mage 1 Baleful Strix 1 Disciple of Bolas 1 Bloodsoaked Champion 1 Cryptbreaker 1 Archfiend of Ifnir 1 Curator of Mysteries 1 Vizier of Tumbling Sands 1 Baleful Ammit 1 Horror of the Broken Lands 1 Wildfire Eternal 1 The Scorpion God 1 Neheb, the Eternal 1 The Locust God 1 Wasp of the Bitter End 1 The Scarab God 1 Nimble Obstructionist Planeswalkers (4) 1 Nicol Bolas, Planeswalker 1 Tezzeret the Schemer 1 Nicol Bolas, God-Pharaoh 1 Nicol Bolas, the Deceiver Lands (39) 1 Reflecting Pool 5 Swamp 5 Mountain 5 Island 1 Shizo, Death's Storehouse 1 Minamo, School at Water's Edge 1 Phyrexian Tower 1 Watery Grave 1 Steam Vents 1 Blood Crypt 1 Graven Cairns 1 Cascade Bluffs 1 Crumbling Necropolis 1 Grixis Panorama 1 Exotic Orchard 1 Dragonskull Summit 1 Drowned Catacomb 1 Command Tower 1 Sulfur Falls 1 Cavern of Souls 1 Thespian's Stage 1 Crucible of the Spirit Dragon 1 Haven of the Spirit Dragon 1 Command Beacon 1 Desert of the Fervent 1 Desert of the Mindful 1 Desert of the Glorified Spells (32) 1 Sol Ring 1 Time Stop 1 Darksteel Ingot 1 Terminate 1 Skullclamp 1 Arcane Denial 1 Izzet Signet 1 Rakdos Signet 1 Damnation 1 Cruel Ultimatum 1 Training Grounds 1 Life's Finale 1 Blasphemous Act 1 Tragic Slip 1 Gem of Becoming 1 Chromatic Lantern 1 Hero's Downfall 1 Swan Song 1 Commander's Sphere 1 Fiery Confluence 1 Mystic Confluence 1 Wretched Confluence 1 Dark Intimations 1 Throne of the God-Pharaoh 1 Gate to the Afterlife 1 Supreme Will 1 Sunset Pyramid 1 Visage of Bolas 1 Torment of Hailfire 1 God-Pharaoh's Gift 1 Imminent Doom 1 Hour of Devastation What do you think

Creatures also often have 'Lords', which can buff an entire MTG creature type
Youll get players scrapping against each other when you play and Enchantment, and youll have a ton of those to play with
Combine that with a fun game, collectibles popularity, and a good price point, and it really worked