For one, being puts it in a strange (though unique) color combination for dragons, one that misses a lot of the typical dragon support
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Table of Contents show The Deck Rat Colony | Illustration by Suzanne Helmigh Commander (1) Creature (46) Accursed Marauder Ayara, First of Locthwain Blood Artist Boggart Trawler God-Eternal Bontu Grim Haruspex Karumonix, the Rat King Lord Skitter, Sewer King Marrow-Gnawer Midnight Reaper Ogre Slumlord Plaguecrafter Rat Colony x32 Vengeful Bloodwitch Zulaport Cutthroat Instant (3) Fell the Profane Hagra Mauling Plumb the Forbidden Sorcery (2) Agadeem's Awakening Bloodline Bidding Enchantment (1) Artifact (14) Altar of Dementia Arcane Signet Charcoal Diamond Fellwar Stone Gathering Stone Jet Medallion Magewright's Stone Mind Stone Phyrexian Altar Sceptre of Eternal Glory Skullclamp Sting, the Glinting Dagger Thought Vessel Throne of Eldraine Land (33) Cabal Coffers Castle Locthwain Cavern of Souls Crypt of Agadeem Phyrexian Tower Secret Tunnel Spymaster's Vault Susur Secundi, Void Altar Swamp x22 Takenuma, Abandoned Mire Urborg, Tomb of Yawgmoth War Room Verminister leads a Rat Colony deck with an emphasis on sacrifice effects to maximize the potential of Rat King, Verminister

The blend of collectible elements with a competitive gameplay drew a wide audience
It was bugging me as to why Niantic would invent N-DESIGN, Inc. as a company name for their cg work and Id have such a hard time finding it on Google, and then Binged it and found, well, a cg company called N-DESIGN, Inc