Urza, Lord High Artificer
Corridor Monitor
Retraction Helix
Cloud Key

   Prerequisites

What do I need to start this combo?
Urza and Cloud Key on the battlefield (Cloud Key with "Artifact" chosen on the battlefield).
Corridor Monitor and Retraction Helix in hand.
You control a creature that doesn't have summoning sickness.
available

   Steps

How does this combo work?
1
Cast Retraction Helix by paying , targeting a creature you control that doesn't have summoning sickness.
2
Cast Corridor Monitor by paying due to Cloud Key.
3
When Corridor Monitor enters, it triggers, untapping the creature targeted by Retraction Helix.
4
Activate Urza's first ability by tapping Corridor Monitor, adding .
5
Activate the creature targeted by Retraction Helix by tapping it, returning Corridor Monitor from the battlefield to your hand.
6
Repeat from step 2.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite storm count
Drafna, Founder of Lat-Nam
0.3%inclusion3 decks1.10K decks
Urza, Lord High Artificer
0.0%inclusion2 decks18.6K decks
Arcum Dagsson
0.0%inclusion1 decks2.50K decks
Emry, Lurker of the Loch
0.0%inclusion1 decks5.90K decks
Gran-Gran
0.2%inclusion1 decks511 decks
Jin-Gitaxias
0.0%inclusion1 decks3.48K decks
New Cards
Sewer-veillance Cam
67%inclusion2 decks3 decks
62%synergy
Big Mother Mouser
33%inclusion1 decks3 decks
32%synergy
Chrome Dome
33%inclusion1 decks3 decks
32%synergy
High Synergy Cards
Sensei's Divining Top
100%inclusion9 decks9 decks
85%synergy
Valley Floodcaller
89%inclusion8 decks9 decks
85%synergy
Tezzeret, Cruel Captain
88%inclusion7 decks8 decks
81%synergy
Flusterstorm
89%inclusion8 decks9 decks
79%synergy
Urza's Saga
89%inclusion8 decks9 decks
72%synergy
Mirrormade
78%inclusion7 decks9 decks
72%synergy
Mindbreak Trap
78%inclusion7 decks9 decks
72%synergy
Mental Misstep
78%inclusion7 decks9 decks
71%synergy
Banishing Knack
67%inclusion6 decks9 decks
65%synergy
Imposter Mech
67%inclusion6 decks9 decks
63%synergy
Top Cards
Mystic Remora
89%inclusion8 decks9 decks
62%synergy
Etherium Sculptor
78%inclusion7 decks9 decks
61%synergy
Swan Song
78%inclusion7 decks9 decks
51%synergy
Manifold Key
67%inclusion6 decks9 decks
60%synergy
Tezzeret the Seeker
67%inclusion6 decks9 decks
58%synergy
Forensic Gadgeteer
67%inclusion6 decks9 decks
56%synergy
Faerie Mastermind
67%inclusion6 decks9 decks
52%synergy
Force of Negation
67%inclusion6 decks9 decks
51%synergy
Isochron Scepter
67%inclusion6 decks9 decks
49%synergy
Phyrexian Metamorph
67%inclusion6 decks9 decks
47%synergy
Game Changers
Mana Vault
100%inclusion9 decks9 decks
90%synergy
The One Ring
89%inclusion8 decks9 decks
76%synergy
Chrome Mox
78%inclusion7 decks9 decks
69%synergy
Ancient Tomb
78%inclusion7 decks9 decks
66%synergy
Fierce Guardianship
78%inclusion7 decks9 decks
55%synergy
Rhystic Study
78%inclusion7 decks9 decks
46%synergy
Mox Diamond
67%inclusion6 decks9 decks
61%synergy
Force of Will
67%inclusion6 decks9 decks
50%synergy
Grim Monolith
44%inclusion4 decks9 decks
39%synergy
Mishra's Workshop
33%inclusion3 decks9 decks
32%synergy
Creatures
Glaring Fleshraker
56%inclusion5 decks9 decks
54%synergy
Displacer Kitten
56%inclusion5 decks9 decks
46%synergy
Emry, Lurker of the Loch
56%inclusion5 decks9 decks
44%synergy
The Reality Chip
56%inclusion5 decks9 decks
43%synergy
Spellskite
44%inclusion4 decks9 decks
33%synergy
Sai, Master Thopterist
44%inclusion4 decks9 decks
32%synergy
Hydroelectric Specimen
44%inclusion4 decks9 decks
31%synergy
Hullbreaker Horror
44%inclusion4 decks9 decks
20%synergy
Kitsa, Otterball Elite
33%inclusion3 decks9 decks
31%synergy
Mirran Spy
33%inclusion3 decks9 decks
30%synergy
Riddlesmith
33%inclusion3 decks9 decks
30%synergy
Liberator, Urza's Battlethopter
33%inclusion3 decks9 decks
28%synergy
Walking Ballista
33%inclusion3 decks9 decks
28%synergy
Thundertrap Trainer
22%inclusion2 decks9 decks
21%synergy
Transplant Theorist
22%inclusion2 decks9 decks
21%synergy
Metalworker
22%inclusion2 decks9 decks
21%synergy
Subtlety
22%inclusion2 decks9 decks
20%synergy
Phyrexian Walker
22%inclusion2 decks9 decks
20%synergy
Volatile Stormdrake
22%inclusion2 decks9 decks
19%synergy
Marvin, Murderous Mimic
22%inclusion2 decks9 decks
19%synergy
Grand Architect
22%inclusion2 decks9 decks
19%synergy
Memnite
22%inclusion2 decks9 decks
18%synergy
Mockingbird
22%inclusion2 decks9 decks
18%synergy
Cyberdrive Awakener
22%inclusion2 decks9 decks
17%synergy
Unctus, Grand Metatect
22%inclusion2 decks9 decks
17%synergy
High Fae Trickster
22%inclusion2 decks9 decks
17%synergy
Clever Impersonator
22%inclusion2 decks9 decks
16%synergy
Ledger Shredder
22%inclusion2 decks9 decks
16%synergy
Spellseeker
22%inclusion2 decks9 decks
14%synergy
Ornithopter
22%inclusion2 decks9 decks
14%synergy
Thought Monitor
22%inclusion2 decks9 decks
12%synergy
Foundry Inspector
22%inclusion2 decks9 decks
8%synergy
The Mechanist, Aerial Artisan
20%inclusion1 decks5 decks
17%synergy
Wan Shi Tong, Librarian
20%inclusion1 decks5 decks
13%synergy
Guidelight Optimizer
13%inclusion1 decks8 decks
12%synergy
Steelswarm Operator
13%inclusion1 decks8 decks
11%synergy
Y'shtola Rhul
13%inclusion1 decks8 decks
10%synergy
Transit Mage
13%inclusion1 decks8 decks
10%synergy
Starwinder
13%inclusion1 decks8 decks
9%synergy
Automated Artificer
11%inclusion1 decks9 decks
11%synergy
Diligent Excavator
11%inclusion1 decks9 decks
11%synergy
Renowned Weaponsmith
11%inclusion1 decks9 decks
10%synergy
Hedron Crawler
11%inclusion1 decks9 decks
10%synergy
Oaken Siren
11%inclusion1 decks9 decks
10%synergy
Battered Golem
11%inclusion1 decks9 decks
10%synergy
Manakin
11%inclusion1 decks9 decks
10%synergy
Traxos, Scourge of Kroog
11%inclusion1 decks9 decks
10%synergy
Kuldotha Forgemaster
11%inclusion1 decks9 decks
10%synergy
Arcum Dagsson
11%inclusion1 decks9 decks
10%synergy
Myr Convert
11%inclusion1 decks9 decks
10%synergy
Instants
Dramatic Reversal
67%inclusion6 decks9 decks
47%synergy
Sink into Stupor
67%inclusion6 decks9 decks
45%synergy
Chain of Vapor
56%inclusion5 decks9 decks
51%synergy
Pact of Negation
56%inclusion5 decks9 decks
46%synergy
Whir of Invention
56%inclusion5 decks9 decks
43%synergy
Mana Drain
56%inclusion5 decks9 decks
29%synergy
Borne Upon a Wind
44%inclusion4 decks9 decks
40%synergy
Snap
44%inclusion4 decks9 decks
26%synergy
Cyclonic Rift
44%inclusion4 decks9 decks
11%synergy
An Offer You Can't Refuse
44%inclusion4 decks9 decks
7%synergy
Commandeer
33%inclusion3 decks9 decks
28%synergy
Into the Flood Maw
33%inclusion3 decks9 decks
27%synergy
Flare of Denial
33%inclusion3 decks9 decks
27%synergy
Muddle the Mixture
33%inclusion3 decks9 decks
18%synergy
Mystical Tutor
33%inclusion3 decks9 decks
11%synergy
Null Elemental Blast
22%inclusion2 decks9 decks
22%synergy
Consign to Memory
22%inclusion2 decks9 decks
21%synergy
Paradoxical Outcome
22%inclusion2 decks9 decks
20%synergy
Misdirection
22%inclusion2 decks9 decks
17%synergy
Spell Pierce
22%inclusion2 decks9 decks
14%synergy
Essence Flux
22%inclusion2 decks9 decks
14%synergy
Dispel
22%inclusion2 decks9 decks
13%synergy
Ghostly Flicker
22%inclusion2 decks9 decks
11%synergy
Rapid Hybridization
22%inclusion2 decks9 decks
-12%synergy
High Tide
22%inclusion2 decks9 decks
-22%synergy
Scour for Scrap
13%inclusion1 decks8 decks
5%synergy
Predict
11%inclusion1 decks9 decks
11%synergy
Steel Sabotage
11%inclusion1 decks9 decks
11%synergy
Snapback
11%inclusion1 decks9 decks
10%synergy
Long-Term Plans
11%inclusion1 decks9 decks
8%synergy
Brain Freeze
11%inclusion1 decks9 decks
7%synergy
Wash Away
11%inclusion1 decks9 decks
7%synergy
Blue Sun's Zenith
11%inclusion1 decks9 decks
0%synergy
Narset's Reversal
11%inclusion1 decks9 decks
-1%synergy
Resculpt
11%inclusion1 decks9 decks
-6%synergy
Frantic Search
11%inclusion1 decks9 decks
-19%synergy
Arcane Denial
11%inclusion1 decks9 decks
-25%synergy
Pongify
11%inclusion1 decks9 decks
-29%synergy
Brainstorm
11%inclusion1 decks9 decks
-30%synergy
Counterspell
11%inclusion1 decks9 decks
-55%synergy
Sorceries
Transmute Artifact
56%inclusion5 decks9 decks
52%synergy
Reshape
44%inclusion4 decks9 decks
38%synergy
Fabricate
44%inclusion4 decks9 decks
23%synergy
Gitaxian Probe
33%inclusion3 decks9 decks
22%synergy
Sea Gate Restoration
33%inclusion3 decks9 decks
18%synergy
Reconstruction
11%inclusion1 decks9 decks
11%synergy
Lunar Insight
11%inclusion1 decks9 decks
10%synergy
Timetwister
11%inclusion1 decks9 decks
9%synergy
Energy Tap
11%inclusion1 decks9 decks
8%synergy
Step Through
11%inclusion1 decks9 decks
6%synergy
Windfall
11%inclusion1 decks9 decks
-11%synergy
Utility Artifacts
Rings of Brighthearth
56%inclusion5 decks9 decks
49%synergy
Mystic Forge
56%inclusion5 decks9 decks
46%synergy
Unwinding Clock
56%inclusion5 decks9 decks
44%synergy
Voltaic Key
44%inclusion4 decks9 decks
39%synergy
Vexing Bauble
33%inclusion3 decks9 decks
32%synergy
Moonsilver Key
33%inclusion3 decks9 decks
30%synergy
Aetherflux Reservoir
33%inclusion3 decks9 decks
27%synergy
Sculpting Steel
33%inclusion3 decks9 decks
26%synergy
Aether Spellbomb
33%inclusion3 decks9 decks
25%synergy
Mishra's Bauble
33%inclusion3 decks9 decks
24%synergy
Lightning Greaves
33%inclusion3 decks9 decks
7%synergy
Sapphire Medallion
33%inclusion3 decks9 decks
-26%synergy
Repurposing Bay
25%inclusion2 decks8 decks
21%synergy
Uthros Research Craft
25%inclusion2 decks8 decks
18%synergy
Apple of Eden, Isu Relic
22%inclusion2 decks9 decks
22%synergy
Damping Sphere
22%inclusion2 decks9 decks
22%synergy
Disruptor Flute
22%inclusion2 decks9 decks
22%synergy
Agatha's Soul Cauldron
22%inclusion2 decks9 decks
21%synergy
Clock of Omens
22%inclusion2 decks9 decks
20%synergy
Staff of Domination
22%inclusion2 decks9 decks
20%synergy
Ichor Wellspring
22%inclusion2 decks9 decks
20%synergy
Mirage Mirror
22%inclusion2 decks9 decks
19%synergy
Urza's Bauble
22%inclusion2 decks9 decks
17%synergy
Codex Shredder
22%inclusion2 decks9 decks
16%synergy
Tormod's Crypt
22%inclusion2 decks9 decks
13%synergy
Extinguisher Battleship
13%inclusion1 decks8 decks
12%synergy
The Endstone
13%inclusion1 decks8 decks
10%synergy
Insight Engine
13%inclusion1 decks8 decks
7%synergy
Goblin Charbelcher
11%inclusion1 decks9 decks
11%synergy
Umbral Mantle
11%inclusion1 decks9 decks
11%synergy
Ugin's Nexus
11%inclusion1 decks9 decks
11%synergy
Dermotaxi
11%inclusion1 decks9 decks
11%synergy
Transmutation Font
11%inclusion1 decks9 decks
10%synergy
Defense Grid
11%inclusion1 decks9 decks
10%synergy
Collector's Vault
11%inclusion1 decks9 decks
10%synergy
Grinding Station
11%inclusion1 decks9 decks
10%synergy
Trinisphere
11%inclusion1 decks9 decks
9%synergy
Torpor Orb
11%inclusion1 decks9 decks
9%synergy
Ichormoon Gauntlet
11%inclusion1 decks9 decks
9%synergy
Conjurer's Bauble
11%inclusion1 decks9 decks
9%synergy
Krark-Clan Ironworks
11%inclusion1 decks9 decks
9%synergy
Elixir of Immortality
11%inclusion1 decks9 decks
8%synergy
Vedalken Orrery
11%inclusion1 decks9 decks
8%synergy
Forsaken Monument
11%inclusion1 decks9 decks
8%synergy
Encroaching Mycosynth
11%inclusion1 decks9 decks
7%synergy
Chimil, the Inner Sun
11%inclusion1 decks9 decks
7%synergy
Grafdigger's Cage
11%inclusion1 decks9 decks
7%synergy
Soul-Guide Lantern
11%inclusion1 decks9 decks
6%synergy
Simulacrum Synthesizer
11%inclusion1 decks9 decks
6%synergy
Welding Jar
11%inclusion1 decks9 decks
6%synergy
Enchantments
Copy Artifact
56%inclusion5 decks9 decks
52%synergy
Copy Enchantment
44%inclusion4 decks9 decks
42%synergy
Steal Enchantment
22%inclusion2 decks9 decks
21%synergy
Training Grounds
22%inclusion2 decks9 decks
15%synergy
Dress Down
11%inclusion1 decks9 decks
9%synergy
Mind Over Matter
11%inclusion1 decks9 decks
9%synergy
Intruder Alarm
11%inclusion1 decks9 decks
8%synergy
Back to Basics
11%inclusion1 decks9 decks
4%synergy
Leyline of Anticipation
11%inclusion1 decks9 decks
2%synergy
Planeswalkers
Ugin, Eye of the Storms
13%inclusion1 decks8 decks
10%synergy
Utility Lands
Otawara, Soaring City
78%inclusion7 decks9 decks
52%synergy
Inventors' Fair
67%inclusion6 decks9 decks
54%synergy
City of Traitors
56%inclusion5 decks9 decks
54%synergy
Cephalid Coliseum
56%inclusion5 decks9 decks
46%synergy
Minamo, School at Water's Edge
56%inclusion5 decks9 decks
43%synergy
Academy Ruins
56%inclusion5 decks9 decks
37%synergy
Treasure Vault
44%inclusion4 decks9 decks
41%synergy
Emergence Zone
44%inclusion4 decks9 decks
40%synergy
Seat of the Synod
44%inclusion4 decks9 decks
26%synergy
Uthros, Titanic Godcore
38%inclusion3 decks8 decks
27%synergy
Crystal Vein
33%inclusion3 decks9 decks
31%synergy
Fomori Vault
33%inclusion3 decks9 decks
30%synergy
Ipnu Rivulet
22%inclusion2 decks9 decks
21%synergy
Buried Ruin
22%inclusion2 decks9 decks
10%synergy
Mistrise Village
13%inclusion1 decks8 decks
3%synergy
Archway of Innovation
11%inclusion1 decks9 decks
0%synergy
Rivendell
11%inclusion1 decks9 decks
0%synergy
Darksteel Citadel
11%inclusion1 decks9 decks
0%synergy
War Room
11%inclusion1 decks9 decks
-5%synergy
Mystic Sanctuary
11%inclusion1 decks9 decks
-39%synergy
Mana Artifacts
Lotus Petal
100%inclusion9 decks9 decks
88%synergy
Arcane Signet
100%inclusion9 decks9 decks
35%synergy
Sol Ring
100%inclusion9 decks9 decks
15%synergy
Mox Opal
89%inclusion8 decks9 decks
79%synergy
Basalt Monolith
89%inclusion8 decks9 decks
79%synergy
Mox Amber
67%inclusion6 decks9 decks
59%synergy
Machine God's Effigy
44%inclusion4 decks9 decks
41%synergy
Chromatic Orrery
33%inclusion3 decks9 decks
31%synergy
Springleaf Drum
33%inclusion3 decks9 decks
30%synergy
Liquimetal Torque
33%inclusion3 decks9 decks
27%synergy
Fellwar Stone
33%inclusion3 decks9 decks
14%synergy
Lion's Eye Diamond
22%inclusion2 decks9 decks
21%synergy
Relic of Legends
22%inclusion2 decks9 decks
20%synergy
Moonsnare Prototype
22%inclusion2 decks9 decks
20%synergy
Jeweled Amulet
22%inclusion2 decks9 decks
19%synergy
Prismatic Lens
22%inclusion2 decks9 decks
19%synergy
Crystal Skull, Isu Spyglass
22%inclusion2 decks9 decks
17%synergy
Everflowing Chalice
22%inclusion2 decks9 decks
6%synergy
Mind Stone
22%inclusion2 decks9 decks
-13%synergy
Cargo Ship
13%inclusion1 decks8 decks
12%synergy
Bender's Waterskin
13%inclusion1 decks8 decks
2%synergy
Serum Powder
11%inclusion1 decks9 decks
11%synergy
Prophetic Prism
11%inclusion1 decks9 decks
11%synergy
The Irencrag
11%inclusion1 decks9 decks
10%synergy
Mox Tantalite
11%inclusion1 decks9 decks
10%synergy
Fractured Powerstone
11%inclusion1 decks9 decks
10%synergy
Lotus Bloom
11%inclusion1 decks9 decks
10%synergy
Sol Talisman
11%inclusion1 decks9 decks
10%synergy
Chromatic Sphere
11%inclusion1 decks9 decks
9%synergy
Paradise Mantle
11%inclusion1 decks9 decks
8%synergy
Hedron Archive
11%inclusion1 decks9 decks
5%synergy
Commander's Sphere
11%inclusion1 decks9 decks
2%synergy
Thought Vessel
11%inclusion1 decks9 decks
-41%synergy
Lands
Scalding Tarn
78%inclusion7 decks9 decks
70%synergy
Polluted Delta
78%inclusion7 decks9 decks
70%synergy
Flooded Strand
67%inclusion6 decks9 decks
58%synergy
Talon Gates of Madara
56%inclusion5 decks9 decks
52%synergy
Gemstone Caverns
56%inclusion5 decks9 decks
49%synergy
Misty Rainforest
56%inclusion5 decks9 decks
48%synergy
Spire of Industry
22%inclusion2 decks9 decks
22%synergy
Tarnished Citadel
11%inclusion1 decks9 decks
11%synergy
Survivors' Encampment
11%inclusion1 decks9 decks
11%synergy
Command Tower
11%inclusion1 decks9 decks
7%synergy
Cavern of Souls
11%inclusion1 decks9 decks
7%synergy
The Mycosynth Gardens
11%inclusion1 decks9 decks
6%synergy