Halo Fountain + Intruder Alarm + Karn, the Great Creator

Halo Fountain
Intruder Alarm
Karn, the Great Creator

Requires
Halo Fountain must be on the battlefield. Intruder Alarm must be on the battlefield. Karn, the Great Creator must be on the battlefield.
Steps
  1. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Halo Fountain to become an artifact creature until end of turn.
  2. Activate a creature you control by tapping it, adding .
  3. Activate Halo Fountain's first ability by paying , tapping and untapping it, creating a 1/1 Citizen creature token.
  4. When the Citizen enters the battlefield, Intruder Alarm triggers, untapping all creatures.
  5. Repeat from step 2.
Results
Infinite creature tokens. Infinite ETB. Infinite mana creatures you control can produce. Infinite untap of creatures.

Shorikai, Genesis Engine
0.05% of 18345 decks 9 decks
Merieke Ri Berit
0.25% of 1988 decks 5 decks
Belisarius Cawl
0.49% of 814 decks 4 decks
Urza, Prince of Kroog
0.08% of 2373 decks 2 decks
Sydri, Galvanic Genius
0.04% of 2307 decks 1 decks
Jodah, the Unifier
0.01% of 18504 decks 1 decks
Urtet, Remnant of Memnarch
0.01% of 13907 decks 1 decks
Dr. Madison Li
0.02% of 5134 decks 1 decks
Falco Spara, Pactweaver
0.02% of 4523 decks 1 decks
Phelddagrif
0.04% of 2693 decks 1 decks
Grand Arbiter Augustin IV
0.01% of 7990 decks 1 decks
Tocasia, Dig Site Mentor
0.09% of 1119 decks 1 decks
Galadriel, Light of Valinor
0.01% of 10170 decks 1 decks
High Synergy Cards
Grim Tutor
62% of 8 decks +58% synergy
Dauthi Voidwalker
62% of 8 decks +55% synergy
Heroic Intervention
83% of 6 decks +54% synergy
Fabricate
55% of 29 decks +49% synergy
Urza's Saga
55% of 29 decks +48% synergy
Unwinding Clock
48% of 29 decks +46% synergy
Ancient Den
48% of 29 decks +43% synergy
Entomb
50% of 8 decks +43% synergy
Orcish Bowmasters
50% of 8 decks +41% synergy
Academy Ruins
45% of 29 decks +40% synergy
Top Cards
Swords to Plowshares
69% of 29 decks +6% synergy
Dark Ritual
62% of 8 decks +40% synergy
Esper Sentinel
55% of 29 decks +35% synergy
Mana Drain
48% of 29 decks +33% synergy
Skullclamp
45% of 29 decks +33% synergy
Isochron Scepter
41% of 29 decks +39% synergy
Silver Myr
41% of 29 decks +39% synergy
Emry, Lurker of the Loch
41% of 29 decks +37% synergy
Dramatic Reversal
41% of 29 decks +36% synergy
Etherium Sculptor
41% of 29 decks +36% synergy
Game Changers
Opposition Agent
62% of 8 decks +56% synergy
Demonic Tutor
62% of 8 decks +41% synergy
Enlightened Tutor
59% of 29 decks +41% synergy
Cyclonic Rift
55% of 29 decks +28% synergy
Vampiric Tutor
50% of 8 decks +33% synergy
Rhystic Study
48% of 29 decks +21% synergy
The One Ring
31% of 29 decks +23% synergy
Mana Vault
24% of 29 decks +18% synergy
Grim Monolith
21% of 29 decks +19% synergy
Urza, Lord High Artificer
21% of 29 decks +17% synergy
Creatures
Eternal Witness
50% of 6 decks +30% synergy
Gold Myr
38% of 29 decks +35% synergy
Foundry Inspector
38% of 29 decks +34% synergy
Unctus, Grand Metatect
34% of 29 decks +33% synergy
Padeem, Consul of Innovation
31% of 29 decks +28% synergy
Aphetto Alchemist
28% of 29 decks +27% synergy
Drumbellower
28% of 29 decks +25% synergy
Sai, Master Thopterist
28% of 29 decks +24% synergy
Fatestitcher
24% of 29 decks +24% synergy
Ornithopter of Paradise
24% of 29 decks +20% synergy
Kotori, Pilot Prodigy
21% of 29 decks +19% synergy
Urza, Lord Protector
21% of 29 decks +19% synergy
White Plume Adventurer
21% of 29 decks +19% synergy
Palladium Myr
21% of 29 decks +19% synergy
Drannith Magistrate
21% of 29 decks +15% synergy
Solemn Simulacrum
21% of 29 decks +7% synergy
Shimmer Myr
17% of 29 decks +16% synergy
Bronze Guardian
17% of 29 decks +15% synergy
Spellskite
17% of 29 decks +14% synergy
The Reality Chip
17% of 29 decks +14% synergy
Mondrak, Glory Dominus
17% of 29 decks +9% synergy
Vedalken Engineer
14% of 29 decks +13% synergy
Oswald Fiddlebender
14% of 29 decks +12% synergy
Master Transmuter
14% of 29 decks +12% synergy
Teshar, Ancestor's Apostle
14% of 29 decks +12% synergy
Deep Gnome Terramancer
14% of 29 decks +12% synergy
Urza, Prince of Kroog
14% of 29 decks +11% synergy
Walking Ballista
14% of 29 decks +11% synergy
Thought Monitor
14% of 29 decks +11% synergy
Phyrexian Metamorph
14% of 29 decks +7% synergy
Sun Titan
14% of 29 decks +4% synergy
Karn, Legacy Reforged
11% of 27 decks +10% synergy
Alloy Myr
10% of 29 decks +10% synergy
Chief Engineer
10% of 29 decks +10% synergy
Arcum Dagsson
10% of 29 decks +10% synergy
Stenn, Paranoid Partisan
10% of 29 decks +9% synergy
Myr Retriever
10% of 29 decks +8% synergy
Shimmer Dragon
10% of 29 decks +8% synergy
Kappa Cannoneer
10% of 29 decks +8% synergy
Angel of the Ruins
10% of 29 decks +7% synergy
Thassa's Oracle
10% of 29 decks +3% synergy
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Teferi's Protection
38% of 29 decks +19% synergy
Path to Exile
38% of 29 decks -9% synergy
Force of Will
28% of 29 decks +17% synergy
Swan Song
28% of 29 decks +11% synergy
Counterspell
28% of 29 decks -15% synergy
Consign to Memory
25% of 12 decks +25% synergy
Dispatch
24% of 29 decks +19% synergy
Force of Negation
24% of 29 decks +15% synergy
Fierce Guardianship
24% of 29 decks +6% synergy
Dovin's Veto
24% of 29 decks +6% synergy
Generous Gift
24% of 29 decks -1% synergy
Whir of Invention
21% of 29 decks +18% synergy
Stifle
17% of 29 decks +17% synergy
Intuition
17% of 29 decks +15% synergy
Mindbreak Trap
17% of 29 decks +13% synergy
Flusterstorm
17% of 29 decks +10% synergy
Arcane Denial
17% of 29 decks -3% synergy
An Offer You Can't Refuse
17% of 29 decks -4% synergy
Crush Contraband
14% of 29 decks +12% synergy
Banishing Knack
10% of 29 decks +10% synergy
Narset's Reversal
10% of 29 decks +7% synergy
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Organic Extinction
31% of 29 decks +29% synergy
Sevinne's Reclamation
28% of 29 decks +20% synergy
Dance of the Manse
24% of 29 decks +20% synergy
Transmute Artifact
21% of 29 decks +20% synergy
Brilliant Restoration
21% of 29 decks +18% synergy
Steelshaper's Gift
17% of 29 decks +15% synergy
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17% of 29 decks +4% synergy
Supreme Verdict
17% of 29 decks +4% synergy
Thoughtcast
14% of 29 decks +10% synergy
Anchor to Reality
10% of 29 decks +10% synergy
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10% of 29 decks +9% synergy
Approach of the Second Sun
10% of 29 decks +7% synergy
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Thousand-Year Elixir
38% of 29 decks +36% synergy
Lightning Greaves
34% of 29 decks +9% synergy
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31% of 29 decks +30% synergy
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28% of 29 decks +27% synergy
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Staff of Domination
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Mystic Forge
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Illusionist's Bracers
24% of 29 decks +23% synergy
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24% of 29 decks +23% synergy
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Parhelion II
21% of 29 decks +19% synergy
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19% of 27 decks +17% synergy
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17% of 29 decks +17% synergy
Weatherlight
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14% of 29 decks +13% synergy
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10% of 29 decks +7% synergy
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50% of 6 decks +47% synergy
Doubling Season
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38% of 29 decks +14% synergy
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28% of 29 decks +10% synergy
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14% of 29 decks +13% synergy
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10% of 29 decks +9% synergy
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24% of 29 decks +22% synergy
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21% of 29 decks +18% synergy
Tezzeret, Betrayer of Flesh
17% of 29 decks +16% synergy
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14% of 29 decks +9% synergy
Teferi, Time Raveler
14% of 29 decks +7% synergy
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Seat of the Synod
45% of 29 decks +39% synergy
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41% of 29 decks +37% synergy
Otawara, Soaring City
41% of 29 decks +25% synergy
Reliquary Tower
38% of 29 decks +8% synergy
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Archway of Innovation
33% of 12 decks +30% synergy
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31% of 29 decks +26% synergy
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24% of 29 decks +14% synergy
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23% of 13 decks +21% synergy
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17% of 29 decks +17% synergy
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17% of 29 decks +17% synergy
Lotus Field
17% of 29 decks +16% synergy
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14% of 29 decks +2% synergy
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10% of 29 decks +10% synergy
Celestial Colonnade
10% of 29 decks +9% synergy
Urza's Power Plant
10% of 29 decks +9% synergy
Urza's Mine
10% of 29 decks +9% synergy
Urza's Tower
10% of 29 decks +9% synergy
Yavimaya, Cradle of Growth
10% of 29 decks +1% synergy
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Sol Ring
100% of 29 decks +16% synergy
Arcane Signet
97% of 29 decks +24% synergy
Talisman of Hierarchy
75% of 8 decks +50% synergy
Talisman of Dominance
62% of 8 decks +30% synergy
Talisman of Progress
55% of 29 decks +31% synergy
Azorius Signet
38% of 29 decks +13% synergy
Fellwar Stone
34% of 29 decks +14% synergy
Basalt Monolith
31% of 29 decks +28% synergy
Mox Opal
28% of 29 decks +23% synergy
Mana Crypt
24% of 29 decks +18% synergy
Liquimetal Torque
21% of 29 decks +17% synergy
Thought Vessel
21% of 29 decks +4% synergy
Cultivator's Caravan
17% of 29 decks +17% synergy
Chrome Mox
17% of 29 decks +11% synergy
Chromatic Lantern
17% of 29 decks +8% synergy
Gilded Lotus
14% of 29 decks +10% synergy
Mox Diamond
14% of 29 decks +9% synergy
Thran Dynamo
14% of 29 decks +9% synergy
Sonic Screwdriver
12% of 24 decks +11% synergy
Decanter of Endless Water
10% of 29 decks +6% synergy
Lands
Command Tower
90% of 29 decks +15% synergy
Breeding Pool
83% of 6 decks +43% synergy
Vault of Champions
75% of 8 decks +49% synergy
Morphic Pool
75% of 8 decks +49% synergy
Godless Shrine
75% of 8 decks +35% synergy
Watery Grave
75% of 8 decks +35% synergy
Hallowed Fountain
72% of 29 decks +32% synergy
Temple Garden
67% of 6 decks +27% synergy
Scrubland
62% of 8 decks +49% synergy
Underground Sea
62% of 8 decks +48% synergy
Sea of Clouds
55% of 29 decks +29% synergy
Prairie Stream
52% of 29 decks +18% synergy
Rejuvenating Springs
50% of 6 decks +22% synergy
Flooded Strand
48% of 29 decks +37% synergy
Exotic Orchard
48% of 29 decks +12% synergy
Razortide Bridge
45% of 29 decks +38% synergy
Tundra
38% of 29 decks +24% synergy
Glacial Fortress
38% of 29 decks +11% synergy
Nimbus Maze
31% of 29 decks +26% synergy
Misty Rainforest
31% of 29 decks +20% synergy
Windswept Heath
28% of 29 decks +17% synergy
Spire of Industry
24% of 29 decks +21% synergy
Adarkar Wastes
24% of 29 decks +5% synergy
Cavern of Souls
21% of 29 decks +14% synergy
Marsh Flats
21% of 29 decks +10% synergy
Polluted Delta
21% of 29 decks +9% synergy
Skycloud Expanse
21% of 29 decks +8% synergy
Deserted Beach
21% of 29 decks +4% synergy
The Mycosynth Gardens
17% of 29 decks +15% synergy
Gemstone Caverns
17% of 29 decks +12% synergy
Irrigated Farmland
17% of 29 decks +9% synergy
Arid Mesa
17% of 29 decks +7% synergy
Bloodstained Mire
17% of 29 decks +7% synergy
Scalding Tarn
17% of 29 decks +6% synergy
Verdant Catacombs
17% of 29 decks +6% synergy
Port Town
17% of 29 decks +2% synergy
Temple of Enlightenment
17% of 29 decks +1% synergy
Azorius Chancery
14% of 29 decks -1% synergy
Seachrome Coast
10% of 29 decks +5% synergy
Hengegate Pathway
10% of 29 decks +3% synergy
Fabled Passage
10% of 29 decks +1% synergy