Miirym turns every nontoken Dragon that enters into two bodies by making a non-legendary token copy. So the deck ramps and cuts costs to land big Dragons quickly, then multiplies them. Each token copy brings its own enter triggers and static abilities. Token doublers, enter-trigger doublers and copy effects stack value on top of this. Dragon-entering payoffs turn the growing flock into burn, treasure, card draw and lethal flying attacks. How it wins: It overwhelms opponents with a doubled board of hasty flying Dragons pumped by double strike, power doubling and damage doubling, alongside burn from each Dragon entering, or it loops extra combats with Aggravated Assault and the mana from Savage Ventmaw or Ancient Copper Dragon. Key roles: - Dragon cost reduction and ramp: Land-fetching, mana dorks, rocks and Dragon-specific discounts get six- and seven-drop Dragons out early, and can make them free or near-free to cast. (Dragonspeaker Shaman, Urza's Incubator, Dracogenesis) - Copy multipliers: Tokens get doubled and enter triggers fire twice. Clone effects that count as nontoken Dragons, or that bypass the legend rule, turn each Dragon cast into several copies alongside Miirym. (Adrix and Nev, Twincasters, Panharmonicon, Deceptive Frostkite) - Cheating Dragons into play: Effects that put creatures directly onto the battlefield or dig for Dragons trigger Miirym without casting. Sneak Attack's sacrificed original still leaves a permanent token copy behind. (Sneak Attack, Ureni of the Unwritten, Selvala's Stampede) - Dragon enter payoffs: Every Dragon entering, and every copy, deals damage, creates treasure, gains life or draws cards. A few incoming copies become a burn barrage. (Scourge of Valkas, Terror of the Peaks, Dragon Tempest) - Big-creature card draw: Many Dragons have 4 or more power, so engines that draw off power-4 creatures entering refill the hand constantly. (Garruk's Uprising, Temur Ascendancy, Elemental Bond) - Combat amplifiers and extra combats: Haste, double strike, power doubling and damage doubling make a single attack lethal. Attack-triggered mana Dragons go infinite with Aggravated Assault. (Atarka, World Render, Twinflame Tyrant, Aggravated Assault)

Miirym, Sentinel Wyrm decklist

• Adrix and Nev, Twincasters
• Aggravated Assault
• An Offer You Can't Refuse
• Ancient Copper Dragon
• Arcane Signet
• Astral Dragon
• Atarka, World Render
• Barbarian Ring
• Birds of Paradise
• Blasphemous Act
• Bloomvine Regent
• Breeding Pool
• Broodcaller Scourge
• Carnelian Orb of Dragonkind
• Cephalid Coliseum
• Command Tower
• Cultivate
• Cursed Mirror
• Deceptive Frostkite
• Dracogenesis
• Dragon Tempest
• Dragon's Hoard
• Dragonborn Champion
• Dragonlord's Servant
• Dragonspeaker Shaman
• Earthquake Dragon
• Elemental Bond
• Encroaching Dragonstorm
• Exotic Orchard
• Fanatic of Rhonas
• Fellwar Stone
• Fierce Guardianship
• 5× Forest
• Ganax, Astral Hunter
• Garruk's Uprising
• Ghostly Flicker
• Hammerhead Tyrant
• Haven of the Spirit Dragon
• Herd Heirloom
• Heroic Intervention
• Hide on the Ceiling
• Hinterland Harbor
• Invasion of Tarkir
• Irma, Part-Time Mutant
• 5× Island
• Jeska's Will
• Karplusan Forest
• Klauth, Unrivaled Ancient
• Lathliss, Dragon Queen
• Maelstrom of the Spirit Dragon
• 3× Mountain
• Nature's Lore
• Outcaster Trailblazer
• Panharmonicon
• Path of Ancestry
• Ponder
• Rockfall Vale
• Sakashima of a Thousand Faces
• Sarkhan Unbroken
• Sarkhan, Soul Aflame
• Savage Ventmaw
• Scaled Nurturer
• Scourge of Valkas
• Selvala's Stampede
• Shifting Woodland
• Shivan Reef
• Skyshroud Claim
• Smuggler's Surprise
• Sneak Attack
• Sol Ring
• Steam Vents
• Stomping Ground
• Stormcarved Coast
• Stormscale Scion
• Swiftfoot Boots
• Temple of Abandon
• Temple of Epiphany
• Temur Ascendancy
• Temur Battlecrier
• Terror of the Peaks
• Thrakkus the Butcher
• Thundermane Dragon
• Turntimber Symbiosis
• Twinflame Tyrant
• Ureni of the Unwritten
• Urza's Incubator
• Will of the Temur
• Wrathful Red Dragon
• Yavimaya Coast