Magic: The Gathering's largely popular Commander format comes with a unique deckbuilding restriction, only allowing a player to include cards in their deck that are within their chosen's commander's color identity
Each damage they take mills them for one
Just this past year, Adventures in the Forgotten Realms added six brand-new legendary dragons to the game, with even more included in the set's tie-in preconstructed commander decks

Yennett is Too Tight | Commander | Jason Alt Commander (1) 1 Yennett, Cryptic Sovereign Creatures (18) 1 Archangel of Tithes 1 Artisan of Kozilek 1 Baird, Steward of Argive 1 Bastion Protector 1 Chancellor of the Spires 1 Diluvian Primordial 1 Elesh Norn, Grand Cenobite 1 Emrakul, the Promised End 1 Grand Arbiter Augustin IV 1 Hokori, Dust Drinker 1 Iona, Shield of Emeria 1 Kismet 1 Lord of the Void 1 Magister Sphinx 1 Pathrazer of Ulamog 1 Sanctum Prelate 1 Sheoldred, Whispering One 1 Void Winnower Instants (9) 1 Brainstorm 1 Cyclonic Rift 1 Foil 1 Force of Will 1 Gush 1 Lim-Dul's Vault 1 Mortify 1 Submerge 1 Thwart Sorceries (10) 1 Approach of the Second Sun 1 Bribery 1 Brilliant Ultimatum 1 Clone Legion 1 Expropriate 1 In Garruk's Wake 1 Plague Wind 1 Ponder 1 Portent 1 Time Warp Enchantments (10) 1 Blind Obedience 1 Consulate Crackdown 1 Future Sight 1 Ghostly Prison 1 Mind's Dilation 1 Propaganda 1 Reconnaissance 1 Rising Waters 1 Rhystic Study 1 Soothsaying Artifacts (15) 1 Azorius Signet 1 Chromatic Lantern 1 Commander's Sphere 1 Darksteel Ingot 1 Dimir Signet 1 Gilded Lotus 1 Lightning Greaves 1 Orzhov Signet 1 Sensei's Divining Top 1 Sol Ring 1 Static Orb 1 Strionic Resonator 1 Swiftfoot Boots 1 Vedalken Shackles 1 Winter Orb Lands (37) 3 Plains 3 Swamp 6 Island 1 Adarkar Wastes 1 Arcane Sanctum 1 Azorius Chancery 1 Bojuka Bog 1 Caves of Koilos 1 City of Brass 1 Command Tower 1 Dimir Aqueduct 1 Drowned Catacomb 1 Evolving Wilds 1 Flooded Strand 1 Glacial Fortress 1 Godless Shrine 1 Hallowed Fountain 1 Isolated Chapel 1 Mana Confluence 1 Maze of Ith 1 Morphic Pool 1 Orzhov Basilica 1 Reliquary Tower 1 Sea of Clouds 1 Terramorphic Expanse 1 Underground River 1 Watery Grave 1 Windswept Heath Troublesome Spirit and creatures like Ribbon Snake, Cloudskate, and Spiketail Drake
