Miirym, Sentinel Wyrm + Bladewing the Risen + Altar of Dementia
Miirym, Sentinel Wyrm
Bladewing the Risen
Altar of Dementia
Requires
Miirym, Sentinel Wyrm must be on the battlefield.
Bladewing the Risen must be in hand.
Altar of Dementia must be on the battlefield.
Mana needed: 
Steps
- Cast Bladewing by paying .
- When Bladewing enters the battlefield, it and Miirym trigger.
- Resolve the Bladewing trigger, returning any Dragon from your graveyard to the battlefield.
- Activate Altar of Dementia by sacrificing Bladewing, causing target player to mill cards equal to Bladewing's power.
- Resolve the Miirym trigger, creating a nonlegendary token copy of Bladewing.
- When the Bladewing token enters the battlefield, it triggers, returning Bladewing from your graveyard to the battlefield.
- Repeat from step 2.
Results
Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mill. Infinite sacrifice triggers. Infinite self-mill. Return all Dragons from your graveyard to the battlefield.
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High Synergy Cards (7)
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+60% synergy
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57% of 7 decks
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60% of 20 decks
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33% of 21 decks
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Kura, the Boundless Sky
33% of 21 decks
+33% synergy
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+32% synergy
Rith, Liberated Primeval
31% of 16 decks
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Ramos, Dragon Engine
30% of 20 decks
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Dragonlord Dromoka
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29% of 17 decks
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Klauth, Unrivaled Ancient
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Hellkite Tyrant
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Old Gnawbone
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Bloom Tender
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25% of 20 decks
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25% of 20 decks
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Faeburrow Elder
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+22% synergy
Silumgar, the Drifting Death
24% of 21 decks
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Wrathful Red Dragon
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Dragonspeaker Shaman
24% of 21 decks
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Ignoble Hierarch
24% of 21 decks
+21% synergy
Goldspan Dragon
24% of 21 decks
+21% synergy
Dockside Extortionist
24% of 21 decks
+16% synergy
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Ancient Brass Dragon
20% of 20 decks
+19% synergy
Renari, Merchant of Marvels
19% of 21 decks
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19% of 21 decks
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19% of 21 decks
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19% of 21 decks
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Cadric, Soul Kindler
18% of 17 decks
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The Ur-Dragon
15% of 20 decks
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15% of 20 decks
+15% synergy
Dromoka, the Eternal
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Teneb, the Harvester
15% of 20 decks
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Darigaaz Reincarnated
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Instants (17)
Swan Song
33% of 21 decks
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Teferi's Protection
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Anguished Unmaking
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Entomb
24% of 21 decks
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Assassin's Trophy
24% of 21 decks
+18% synergy
An Offer You Can't Refuse
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Worldly Tutor
19% of 21 decks
+12% synergy
Mana Drain
19% of 21 decks
+11% synergy
Fierce Guardianship
19% of 21 decks
+10% synergy
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Negate
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Heroic Intervention
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Boros Charm
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Goryo's Vengeance
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Frantic Search
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Reanimate
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Monster Manual
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Hallowed Fountain
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Blood Crypt
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Bloodstained Mire
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Scalding Tarn
33% of 21 decks
+22% synergy
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+26% synergy
Temple of the Dragon Queen
29% of 21 decks
+28% synergy
Zagoth Triome
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+21% synergy
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+19% synergy
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+21% synergy
Underground Sea
24% of 21 decks
+20% synergy
Woodland Cemetery
24% of 21 decks
+18% synergy
Reflecting Pool
24% of 21 decks
+18% synergy
Cinder Glade
24% of 21 decks
+15% synergy
City of Brass
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+14% synergy
Marsh Flats
24% of 21 decks
+12% synergy
Plateau
20% of 20 decks
+17% synergy
Savannah
20% of 20 decks
+17% synergy
Scrubland
20% of 20 decks
+17% synergy
Raffine's Tower
20% of 20 decks
+16% synergy
Spara's Headquarters
20% of 20 decks
+16% synergy
Canopy Vista
20% of 20 decks
+12% synergy
Forbidden Orchard
19% of 21 decks
+16% synergy