Miirym, Sentinel Wyrm doubles every nontoken Dragon that enters under its controller's control by making a non-legendary token copy of it, so each Dragon cast is effectively two. That means enter-the-battlefield triggers fire twice and legendary Dragons can be copied freely. The deck ramps hard, often through Treasure that Dragons and their copies generate, to land Miirym early and then chain big flying Dragons. It builds an airborne army, with clone effects multiplying the best Dragons further and combo-style loops turning repeated entries into explosive turns. How it wins: It overwhelms opponents with a rapidly doubling force of flying Dragon tokens and copied enter-the-battlefield effects, closing games through aggressive combat in the air or a combo turn of repeated Dragon entries. Key roles: - Ramp and Treasure: Accelerates into Miirym and expensive Dragons ahead of schedule. Treasure-making Dragons double their output when Miirym copies them, which funds more Dragons the same turn. - Value-trigger Dragons: Dragons whose enter-the-battlefield abilities deal damage, draw cards, destroy things or make Treasure, so Miirym's token copy repeats the effect and every cast swings the game. - Clones and copy effects: Creatures and spells that copy Dragons. A nontoken clone that enters as a Dragon triggers Miirym again for an extra token, and copying Miirym itself multiplies the doubling. - Flicker and re-entry: Effects that blink or return Dragons to hand so they re-enter and retrigger both their own abilities and Miirym. These loops are the backbone of the deck's combo potential. - Aggressive flying finishers: Large evasive Dragons and effects that grant haste or pump the team, so freshly doubled fliers attack immediately and end the game quickly. - Dragon cost reduction and tutors: Cards that make Dragons cheaper or find them, keeping a steady stream of nontoken Dragons flowing so Miirym triggers every turn.

Miirym, Sentinel Wyrm decklist

• Terror of the Peaks
• Scourge of Valkas
• Ganax, Astral Hunter
• Ureni of the Unwritten
• Lathliss, Dragon Queen
• Sarkhan, Soul Aflame
• Dragonspeaker Shaman
• Birds of Paradise
• Galazeth Prismari
• Dragonlord Atarka
• Will of the Temur
• Sarkhan Unbroken
• Dragon's Hoard
• Pongify
• Beast Within
• Arcane Denial
• Counterspell
• Spark Double
• Phantasmal Image
• Deceptive Frostkite
• Ghostly Flicker
• Temur Sabertooth
• Deadeye Navigator
• Dragon Tempest
• Rhythm of the Wild
• Temur Ascendancy
• Dragonlord's Servant
• Korlessa, Scale Singer
• Goldspan Dragon
• Savage Ventmaw
• Lozhan, Dragons' Legacy
• Demanding Dragon
• Klauth, Unrivaled Ancient
• Temur Battlecrier