Miirym copies every nontoken Dragon that enters under your control, so the deck is built around a large package of Dragons with enter-the-battlefield effects, which each get doubled. Ramp and cost reducers get the Dragons out early, and every Dragon entering also feeds triggers that deal damage, draw cards, make more Dragons or add combat power. The result is a board of big fliers that overwhelms opponents in the air. How it wins: Flying Dragons, copied by Miirym and boosted by double strike and attack triggers, hit hard in the air while enter-the-battlefield damage clears blockers, with Terror of Mount Velus and Atarka, World Render turning the whole team into double strikers. Key roles: - Mana ramp: Gets the six-mana commander and expensive Dragons onto the battlefield early, such as Sol Ring and Cultivate. - Dragon cost reducers: Make Dragon spells cheaper so multiple Dragons land in one turn, such as Dragonlord's Servant and Sarkhan, Soul Aflame. - Enter-the-battlefield value Dragons: Give a lasting effect each time they arrive, doubled by Miirym, such as Dragonlord Atarka and Terror of Mount Velus. - Dragon-enter payoffs: Turn every Dragon arrival into damage, cards or tokens, such as Dragon Tempest and Dragon's Hoard. - Combat multipliers: Give double strike or extra power so the fliers finish the game, such as Atarka, World Render and Thrakkus the Butcher.

Miirym, Sentinel Wyrm decklist

• An Offer You Can't Refuse
• Arcane Signet
• Atarka, World Render
• Atsushi, the Blazing Sky
• Beast Within
• Become the Avalanche
• Blasphemous Act
• Bloomvine Regent
• Bountiful Landscape
• Broodcaller Scourge
• Chaos Warp
• Cinder Glade
• Command Tower
• Cultivate
• Cursed Mirror
• Deceptive Frostkite
• Dragon Tempest
• Dragon's Hoard
• Dragonlord Atarka
• Dragonlord's Servant
• Dragonmaster Outcast
• Drakuseth, Maw of Flames
• Elemental Bond
• Encroaching Dragonstorm
• Exotic Orchard
• Farseek
• Fellwar Stone
• Flooded Grove
• 5× Forest
• Frontier Bivouac
• Frontier Siege
• Garruk's Uprising
• Glorybringer
• Haven of the Spirit Dragon
• Hellkite Courser
• Hinterland Harbor
• 3× Island
• Karplusan Forest
• Kessig Wolf Run
• Kiora, Behemoth Beckoner
• Kodama's Reach
• Lapis Orb of Dragonkind
• Lathliss, Dragon Queen
• Leyline Tyrant
• Loki's Double
• Lozhan, Dragons' Legacy
• Mossfire Valley
• Mosswort Bridge
• 5× Mountain
• Nature's Lore
• Nesting Dragon
• Nogi, Draco-Zealot
• Path of Ancestry
• Rampant Growth
• Rapid Hybridization
• Reality Shift
• Reflections of Littjara
• Rockfall Vale
• Rootbound Crag
• Sarkhan, Soul Aflame
• Savage Ventmaw
• Scourge of the Throne
• Selvala's Stampede
• Sheltered Thicket
• Shivan Reef
• Snakeskin Veil
• Sol Ring
• Spit Flame
• Steel Hellkite
• Stormbreath Dragon
• Stubborn Denial
• Sulfur Falls
• Swiftwater Cliffs
• Talisman of Creativity
• Talisman of Impulse
• Temple of Abandon
• Temple of Mystery
• Temple of the Dragon Queen
• Temur Ascendancy
• Terror of Mount Velus
• Thrakkus the Butcher
• Three Visits
• Thunderbreak Regent
• Thundermane Dragon
• Ureni of the Unwritten
• Ureni, the Song Unending
• Vengeful Ancestor
• Whirlwing Stormbrood
• Yavimaya Coast