Intruder Alarm
Maskwood Nexus
Karn, the Great Creator

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Creatures you control can tap to produce at least 3.

   Steps

How does this combo work?
1
Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Maskwood Nexus to become a 4/4 artifact creature until end of turn.
2
Activate any number of mana-producing creatures you control by tapping them, adding at least 3.
3
Activate Maskwood Nexus by paying 3 and tapping it, creating a 2/2 Shapeshifter creature token.
4
When the Shapeshifter enters the battlefield, Intruder Alarm triggers, untapping all creatures.
5
Repeat from step 2.
6
If creatures you control can tap to produce at least 4, this combo nets infinite mana.

   Results

What do I get from this combo?
Infinite creature tokens
Infinite ETB
Infinite mana creatures you control can produce
Infinite untap of creatures
Infinite untap of creatures you control
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Utility Lands
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23%synergy
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19%synergy
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Mana Artifacts
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22%synergy
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Lands
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Hallowed Fountain
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Watery Grave
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Exotic Orchard
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Temple Garden
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Stomping Ground
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Razortide Bridge
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Breeding Pool
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Slagwoods Bridge
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27%synergy
Shivan Reef
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Rustvale Bridge
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22%synergy
Goldmire Bridge
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Karplusan Forest
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Caves of Koilos
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Ketria Triome
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Godless Shrine
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Polluted Delta
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Silverbluff Bridge
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Underground River
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Misty Rainforest
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9%synergy
Yavimaya Coast
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-7%synergy
Darkmoss Bridge
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16%synergy
Drossforge Bridge
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16%synergy
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Indatha Triome
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-8%synergy
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19%inclusion3 decks16 decks
-9%synergy
Battlefield Forge
19%inclusion3 decks16 decks
-11%synergy
Blood Crypt
19%inclusion3 decks16 decks
-20%synergy
Brushland
18%inclusion3 decks17 decks
-3%synergy
Raffine's Tower
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Spara's Headquarters
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-9%synergy
Scalding Tarn
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6%synergy
Flooded Strand
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5%synergy
Volcanic Island
16%inclusion3 decks19 decks
2%synergy
Adarkar Wastes
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-9%synergy
Tanglepool Bridge
15%inclusion3 decks20 decks
13%synergy
Overflowing Basin
15%inclusion3 decks20 decks
6%synergy
Hinterland Harbor
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-19%synergy
Spire of Industry
13%inclusion4 decks30 decks
10%synergy
Reflecting Pool
13%inclusion4 decks30 decks
8%synergy
Cavern of Souls
13%inclusion4 decks30 decks
6%synergy
City of Brass
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6%synergy