Sidisi, Undead Vizier + Helm of the Host + Beacon of Tomorrows
Sidisi, Undead Vizier
Helm of the Host
Beacon of Tomorrows
Requires
Sidisi, Undead Vizier must be on the battlefield.
Helm of the Host must be on the battlefield.
Beacon of Tomorrows must be in the library.
Helm of the Host attached to Sidisi.
Mana needed: 
each turn
each turn
Steps
- At the beginning of combat on your turn, Helm of the Host triggers, creating a non-legendary copy of Sidisi with haste.
- The non-legendary Sidisi enters the battlefield, triggering its exploit ability, sacrificing itself.
- Sidisi's second ability triggers, causing you to search your library for Beacon of Tomorrows, put it into your hand, and shuffle your library.
- Cast Beacon of Tomorrows by paying , causing you to take an extra turn after this one and shuffle it into your library.
- Repeat.
Results
Infinite turns.
Esika, God of the Tree
0.02% of 17767 decks
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Archelos, Lagoon Mystic
0.03% of 3380 decks
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Gisa and Geralf
0.02% of 4645 decks
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New Cards
Valgavoth, Terror Eater
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Leyline of Mutation
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+82% synergy
High Synergy Cards
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Creatures
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Obeka, Splitter of Seconds
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Sisay, Weatherlight Captain
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Bloom Tender
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+67% synergy
Seedborn Muse
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Dockside Extortionist
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Jin-Gitaxias, Progress Tyrant
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Accursed Marauder
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Mikaeus, the Unhallowed
40% of 5 decks
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Hullbreaker Horror
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+33% synergy
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Grand Arbiter Augustin IV
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Avacyn, Angel of Hope
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Jegantha, the Wellspring
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+22% synergy
Volo, Guide to Monsters
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Scaled Herbalist
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+25% synergy
Jaspera Sentinel
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+24% synergy
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+24% synergy
Sporemound
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+23% synergy
Elvish Reclaimer
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+23% synergy
Greensleeves, Maro-Sorcerer
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Vorinclex, Voice of Hunger
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+22% synergy
Ashaya, Soul of the Wild
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Ancient Greenwarden
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Aesi, Tyrant of Gyre Strait
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Avenger of Zendikar
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Corpse Connoisseur
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+19% synergy
Naru Meha, Master Wizard
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Instants
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Deflecting Swat
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+84% synergy
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+82% synergy
Dovin's Veto
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+81% synergy
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+37% synergy
Noxious Revival
75% of 4 decks
+69% synergy
Worldly Tutor
75% of 4 decks
+61% synergy
Soul Partition
67% of 3 decks
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Counterflux
67% of 3 decks
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67% of 3 decks
+60% synergy
Eladamri's Call
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Mental Misstep
60% of 5 decks
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Entomb
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Pact of Negation
60% of 5 decks
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Mystical Tutor
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Fierce Guardianship
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Dark Ritual
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+38% synergy
Cyclonic Rift
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Lose Focus
40% of 5 decks
+40% synergy
Summoner's Pact
25% of 4 decks
+24% synergy
Chord of Calling
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Crop Rotation
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+15% synergy
False Cure
20% of 5 decks
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Utility Artifacts
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Enchantments
Mirari's Wake
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Leyline of the Guildpact
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Mystic Remora
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Rooftop Storm
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Planeswalkers
Teferi, Time Raveler
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+93% synergy
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Utility Lands
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Yavimaya, Cradle of Growth
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Otawara, Soaring City
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Three Tree City
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Bojuka Bog
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Oboro, Palace in the Clouds
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Tolaria West
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Guildless Commons
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Ghost Quarter
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Witch's Cottage
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Phyrexian Tower
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+12% synergy
Urborg, Tomb of Yawgmoth
20% of 5 decks
+10% synergy
Ancient Tomb
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+9% synergy
Cabal Coffers
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+9% synergy
Reliquary Tower
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Mana Artifacts
Talisman of Creativity
100% of 3 decks
+71% synergy
Sol Ring
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+16% synergy
Arcane Signet
80% of 5 decks
+8% synergy
Talisman of Curiosity
75% of 4 decks
+63% synergy
Chromatic Orrery
60% of 5 decks
+58% synergy
Lotus Petal
60% of 5 decks
+53% synergy
Chromatic Lantern
60% of 5 decks
+50% synergy
Fellwar Stone
60% of 5 decks
+39% synergy
Patchwork Banner
50% of 2 decks
+39% synergy
Springleaf Drum
20% of 5 decks
+18% synergy
Worn Powerstone
20% of 5 decks
+17% synergy
Lands
Bountiful Promenade
100% of 3 decks
+76% synergy
Spire Garden
100% of 3 decks
+76% synergy
Sea of Clouds
100% of 3 decks
+74% synergy
Luxury Suite
100% of 3 decks
+74% synergy
The World Tree
100% of 3 decks
+66% synergy
Sacred Foundry
100% of 3 decks
+64% synergy
Hallowed Fountain
100% of 3 decks
+59% synergy
Command Tower
100% of 5 decks
+26% synergy
Overgrown Tomb
75% of 4 decks
+32% synergy
Deserted Beach
67% of 3 decks
+51% synergy
Overgrown Farmland
67% of 3 decks
+51% synergy
Raugrin Triome
67% of 3 decks
+40% synergy
Savai Triome
67% of 3 decks
+39% synergy
Indatha Triome
67% of 3 decks
+35% synergy
Ketria Triome
67% of 3 decks
+34% synergy
City of Brass
60% of 5 decks
+52% synergy
Fabled Passage
60% of 5 decks
+51% synergy
Marsh Flats
60% of 5 decks
+49% synergy
Verdant Catacombs
60% of 5 decks
+49% synergy
Misty Rainforest
60% of 5 decks
+48% synergy
Morphic Pool
60% of 5 decks
+34% synergy
Zagoth Triome
50% of 4 decks
+19% synergy
Shipwreck Marsh
40% of 5 decks
+21% synergy
Exotic Orchard
40% of 5 decks
+4% synergy
Watery Grave
40% of 5 decks
-1% synergy
Plateau
33% of 3 decks
+21% synergy
Savannah
33% of 3 decks
+20% synergy
Taiga
33% of 3 decks
+20% synergy
Scrubland
33% of 3 decks
+20% synergy
Volcanic Island
33% of 3 decks
+20% synergy
Woodland Chasm
25% of 4 decks
+20% synergy
Flooded Grove
25% of 4 decks
+13% synergy
Bayou
25% of 4 decks
+11% synergy
Tropical Island
25% of 4 decks
+11% synergy
Temple of Mystery
25% of 4 decks
+8% synergy
Golgari Rot Farm
25% of 4 decks
+7% synergy
Simic Growth Chamber
25% of 4 decks
+5% synergy
Llanowar Wastes
25% of 4 decks
-1% synergy
Yavimaya Coast
25% of 4 decks
-1% synergy
Holdout Settlement
20% of 5 decks
+19% synergy
Survivors' Encampment
20% of 5 decks
+19% synergy
Jwar Isle Refuge
20% of 5 decks
+18% synergy
Ice Tunnel
20% of 5 decks
+17% synergy
Unclaimed Territory
20% of 5 decks
+15% synergy
Reflecting Pool
20% of 5 decks
+15% synergy
Prismatic Vista
20% of 5 decks
+14% synergy
Dismal Backwater
20% of 5 decks
+13% synergy
Clearwater Pathway
20% of 5 decks
+10% synergy
Polluted Delta
20% of 5 decks
+9% synergy
Underground Sea
20% of 5 decks
+6% synergy