River Song (Commander) - Polymorph

River Song
Rank #630
33decks
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Background image for How To Be New and Cannibalize a Deck for the First Time
Roman Milan
Oct 21, 2025
Roman Milan
How To Be New and Cannibalize a Deck for the First Time
If you're playing Commander, you'll eventually need to pillage cards from one deck to make another - Roman Milan walks us through the whole ordeal.
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Polymorph
100%inclusion33 decks33 decks
99%synergy
Proteus Staff
91%inclusion30 decks33 decks
90%synergy
Transmogrify
91%inclusion30 decks33 decks
90%synergy
Reality Scramble
82%inclusion27 decks33 decks
81%synergy
Divergent Transformations
82%inclusion27 decks33 decks
81%synergy
Neera, Wild Mage
79%inclusion26 decks33 decks
77%synergy
Field of Ruin
70%inclusion23 decks33 decks
68%synergy
Ovika, Enigma Goliath
70%inclusion23 decks33 decks
64%synergy
Rivendell
67%inclusion22 decks33 decks
63%synergy
Reito Lantern
64%inclusion21 decks33 decks
63%synergy
Top Cards
Brainstorm
82%inclusion27 decks33 decks
38%synergy
Chaos Warp
73%inclusion24 decks33 decks
31%synergy
Niv-Mizzet, Parun
67%inclusion22 decks33 decks
39%synergy
Counterspell
67%inclusion22 decks33 decks
14%synergy
Junktroller
64%inclusion21 decks33 decks
63%synergy
Etali, Primal Storm
58%inclusion19 decks33 decks
53%synergy
Transplant Theorist
58%inclusion19 decks33 decks
57%synergy
The Reality Chip
58%inclusion19 decks33 decks
53%synergy
Lightning Greaves
58%inclusion19 decks33 decks
34%synergy
Spell Crumple
58%inclusion19 decks33 decks
57%synergy
Game Changers
Consecrated Sphinx
48%inclusion16 decks33 decks
45%synergy
Jeska's Will
36%inclusion12 decks33 decks
7%synergy
Rhystic Study
33%inclusion11 decks33 decks
9%synergy
Cyclonic Rift
30%inclusion10 decks33 decks
6%synergy
Fierce Guardianship
24%inclusion8 decks33 decks
3%synergy
Gamble
18%inclusion6 decks33 decks
1%synergy
Mystical Tutor
18%inclusion6 decks33 decks
-4%synergy
The One Ring
9.1%inclusion3 decks33 decks
0%synergy
Force of Will
6.1%inclusion2 decks33 decks
-6%synergy
Creatures
Timestream Navigator
52%inclusion17 decks33 decks
50%synergy
Hullbreaker Horror
52%inclusion17 decks33 decks
44%synergy
Jin-Gitaxias, Progress Tyrant
52%inclusion17 decks33 decks
50%synergy
Dutiful Knowledge Seeker
50%inclusion1 decks2 decks
50%synergy
Ancient Silver Dragon
48%inclusion16 decks33 decks
46%synergy
Third Path Iconoclast
48%inclusion16 decks33 decks
31%synergy
Talrand, Sky Summoner
45%inclusion15 decks33 decks
29%synergy
Young Pyromancer
42%inclusion14 decks33 decks
25%synergy
Tomb Trawler
42%inclusion14 decks33 decks
42%synergy
Krenko's Buzzcrusher
39%inclusion13 decks33 decks
39%synergy
Nezahal, Primal Tide
39%inclusion13 decks33 decks
38%synergy
Jalira, Master Polymorphist
33%inclusion11 decks33 decks
33%synergy
Matoya, Archon Elder
33%inclusion1 decks3 decks
33%synergy
Tellah, Great Sage
33%inclusion1 decks3 decks
30%synergy
Chrome Companion
33%inclusion1 decks3 decks
33%synergy
Thassa, God of the Sea
30%inclusion10 decks33 decks
30%synergy
The Locust God
30%inclusion10 decks33 decks
22%synergy
Blightsteel Colossus
30%inclusion10 decks33 decks
29%synergy
Marang River Regent
25%inclusion1 decks4 decks
24%synergy
Magmatic Hellkite
25%inclusion1 decks4 decks
24%synergy
Jade-Cast Sentinel
25%inclusion1 decks4 decks
25%synergy
Fireflux Squad
24%inclusion8 decks33 decks
24%synergy
Magnus the Red
21%inclusion7 decks33 decks
19%synergy
Barkform Harvester
19%inclusion5 decks27 decks
18%synergy
Utvara Hellkite
18%inclusion6 decks33 decks
17%synergy
Sphinx of the Second Sun
18%inclusion6 decks33 decks
17%synergy
Storm-Kiln Artist
18%inclusion6 decks33 decks
-21%synergy
Canal Dredger
18%inclusion6 decks33 decks
18%synergy
Drakuseth, Maw of Flames
15%inclusion5 decks33 decks
13%synergy
Boldwyr Heavyweights
15%inclusion5 decks33 decks
15%synergy
Noble Benefactor
15%inclusion5 decks33 decks
15%synergy
Goblin Electromancer
15%inclusion5 decks33 decks
-14%synergy
Archmage Emeritus
15%inclusion5 decks33 decks
-19%synergy
Jin-Gitaxias, Core Augur
15%inclusion5 decks33 decks
14%synergy
Baral and Kari Zev
12%inclusion4 decks33 decks
10%synergy
Eager Construct
12%inclusion4 decks33 decks
12%synergy
Myr Custodian
12%inclusion4 decks33 decks
12%synergy
Ancient Copper Dragon
12%inclusion4 decks33 decks
9%synergy
Octavia, Living Thesis
12%inclusion4 decks33 decks
10%synergy
Hired Giant
12%inclusion4 decks33 decks
12%synergy
Reito Sentinel
12%inclusion4 decks33 decks
12%synergy
Psychosis Crawler
9.1%inclusion3 decks33 decks
1%synergy
Augury Owl
9.1%inclusion3 decks33 decks
9%synergy
Pathrazer of Ulamog
9.1%inclusion3 decks33 decks
8%synergy
Hoverstone Pilgrim
9.1%inclusion3 decks33 decks
9%synergy
Vesuvan Drifter
9.1%inclusion3 decks33 decks
9%synergy
Johann, Apprentice Sorcerer
9.1%inclusion3 decks33 decks
8%synergy
It That Betrays
9.1%inclusion3 decks33 decks
8%synergy
Twinflame Tyrant
7.1%inclusion1 decks14 decks
5%synergy
Niv-Mizzet, Visionary
7.1%inclusion1 decks14 decks
-5%synergy
Instants
Guff Rewrites History
52%inclusion17 decks33 decks
50%synergy
Chaos Mutation
45%inclusion15 decks33 decks
44%synergy
An Offer You Can't Refuse
36%inclusion12 decks33 decks
0%synergy
Pongify
33%inclusion11 decks33 decks
6%synergy
Opt
33%inclusion11 decks33 decks
-2%synergy
Arcane Denial
33%inclusion11 decks33 decks
4%synergy
Invert Polarity
31%inclusion9 decks29 decks
19%synergy
Impulse
30%inclusion10 decks33 decks
25%synergy
Swan Song
27%inclusion9 decks33 decks
6%synergy
Experimental Augury
24%inclusion8 decks33 decks
22%synergy
Rapid Hybridization
21%inclusion7 decks33 decks
4%synergy
Anticipate
21%inclusion7 decks33 decks
20%synergy
Sink into Stupor
19%inclusion6 decks31 decks
2%synergy
Synthetic Destiny
18%inclusion6 decks33 decks
18%synergy
Telling Time
15%inclusion5 decks33 decks
14%synergy
Negate
15%inclusion5 decks33 decks
-18%synergy
Wild Magic Surge
15%inclusion5 decks33 decks
12%synergy
Reality Shift
15%inclusion5 decks33 decks
2%synergy
Mana Drain
15%inclusion5 decks33 decks
-1%synergy
Dig Through Time
15%inclusion5 decks33 decks
3%synergy
Brainsurge
13%inclusion4 decks31 decks
8%synergy
Frantic Search
12%inclusion4 decks33 decks
-30%synergy
Slip Out the Back
12%inclusion4 decks33 decks
7%synergy
Deflecting Swat
12%inclusion4 decks33 decks
-8%synergy
Abrade
12%inclusion4 decks33 decks
-7%synergy
Cyber Conversion
9.1%inclusion3 decks33 decks
8%synergy
Deliberate
9.1%inclusion3 decks33 decks
7%synergy
Audacious Swap
9.1%inclusion3 decks33 decks
9%synergy
Lightning Bolt
9.1%inclusion3 decks33 decks
-20%synergy
Blessed Reincarnation
9.1%inclusion3 decks33 decks
9%synergy
Moment of Truth
9.1%inclusion3 decks33 decks
8%synergy
Delightful Discovery
7.7%inclusion1 decks13 decks
7%synergy
Bulk Up
7.7%inclusion1 decks13 decks
5%synergy
Muddle the Mixture
6.1%inclusion2 decks33 decks
-6%synergy
Zoyowa's Justice
6.1%inclusion2 decks33 decks
5%synergy
Thrill of Possibility
6.1%inclusion2 decks33 decks
-8%synergy
Fact or Fiction
6.1%inclusion2 decks33 decks
-1%synergy
Tibalt's Trickery
6.1%inclusion2 decks33 decks
4%synergy
Supreme Will
6.1%inclusion2 decks33 decks
5%synergy
You See a Pair of Goblins
6.1%inclusion2 decks33 decks
5%synergy
Resculpt
6.1%inclusion2 decks33 decks
-2%synergy
Condescend
6.1%inclusion2 decks33 decks
5%synergy
Peer Through Depths
6.1%inclusion2 decks33 decks
6%synergy
Force of Negation
6.1%inclusion2 decks33 decks
-4%synergy
Bolt Bend
6.1%inclusion2 decks33 decks
2%synergy
Arcane Infusion
6.1%inclusion2 decks33 decks
4%synergy
Valakut Awakening
6.1%inclusion2 decks33 decks
-3%synergy
Creative Outburst
6.1%inclusion2 decks33 decks
5%synergy
Sorceries
Dream Cache
52%inclusion17 decks33 decks
51%synergy
Blasphemous Act
48%inclusion16 decks33 decks
10%synergy
Preordain
45%inclusion15 decks33 decks
11%synergy
Sundering Eruption
45%inclusion14 decks31 decks
40%synergy
Mystic Speculation
42%inclusion14 decks33 decks
42%synergy
From the Ashes
39%inclusion13 decks33 decks
39%synergy
Cleansing Wildfire
33%inclusion11 decks33 decks
32%synergy
Ingenious Mastery
33%inclusion11 decks33 decks
32%synergy
Memories Returning
33%inclusion1 decks3 decks
32%synergy
Systems Override
33%inclusion1 decks3 decks
33%synergy
Expressive Iteration
30%inclusion10 decks33 decks
7%synergy
Mass Polymorph
27%inclusion9 decks33 decks
27%synergy
Ponder
24%inclusion8 decks33 decks
-14%synergy
Serum Visions
24%inclusion8 decks33 decks
6%synergy
Nanogene Conversion
24%inclusion8 decks33 decks
23%synergy
Windfall
21%inclusion7 decks33 decks
-5%synergy
Krenko's Command
21%inclusion7 decks33 decks
19%synergy
Dragon Fodder
21%inclusion7 decks33 decks
19%synergy
Rally at the Hornburg
18%inclusion6 decks33 decks
18%synergy
Role Reversal
18%inclusion6 decks33 decks
17%synergy
Mana Geyser
18%inclusion6 decks33 decks
-3%synergy
Indomitable Creativity
18%inclusion6 decks33 decks
18%synergy
Geomancer's Gambit
15%inclusion5 decks33 decks
14%synergy
Vandalblast
15%inclusion5 decks33 decks
-11%synergy
Flood of Tears
15%inclusion5 decks33 decks
14%synergy
Song of Totentanz
15%inclusion5 decks33 decks
13%synergy
Forbidden Friendship
15%inclusion5 decks33 decks
15%synergy
Chain Reaction
12%inclusion4 decks33 decks
7%synergy
Ral's Reinforcements
12%inclusion4 decks33 decks
11%synergy
Solve the Equation
12%inclusion4 decks33 decks
-1%synergy
Amass the Components
9.1%inclusion3 decks33 decks
9%synergy
Mizzix's Mastery
9.1%inclusion3 decks33 decks
-11%synergy
Day's Undoing
9.1%inclusion3 decks33 decks
8%synergy
Hordeling Outburst
9.1%inclusion3 decks33 decks
8%synergy
Chaotic Transformation
9.1%inclusion3 decks33 decks
8%synergy
Portent
9.1%inclusion3 decks33 decks
8%synergy
Chandra's Ignition
9.1%inclusion3 decks33 decks
2%synergy
Enter the Enigma
8.7%inclusion2 decks23 decks
2%synergy
Lunar Insight
7.7%inclusion1 decks13 decks
7%synergy
Sleight of Hand
6.1%inclusion2 decks33 decks
2%synergy
Bonfire of the Damned
6.1%inclusion2 decks33 decks
6%synergy
Isengard Unleashed
6.1%inclusion2 decks33 decks
5%synergy
Faithless Looting
6.1%inclusion2 decks33 decks
-27%synergy
Fabricate
6.1%inclusion2 decks33 decks
-2%synergy
Devastation Tide
6.1%inclusion2 decks33 decks
5%synergy
Sea Gate Restoration
6.1%inclusion2 decks33 decks
-2%synergy
Song-Mad Treachery
6.1%inclusion2 decks33 decks
5%synergy
Personal Tutor
6.1%inclusion2 decks33 decks
1%synergy
Utility Artifacts
Swiftfoot Boots
52%inclusion17 decks33 decks
23%synergy
Scroll Rack
48%inclusion16 decks33 decks
47%synergy
Palantír of Orthanc
36%inclusion12 decks33 decks
36%synergy
Conjurer's Bauble
33%inclusion11 decks33 decks
32%synergy
Crystal Ball
24%inclusion8 decks33 decks
24%synergy
River Song's Diary
21%inclusion7 decks33 decks
20%synergy
Treasure Map
18%inclusion6 decks33 decks
17%synergy
Goblin Charbelcher
18%inclusion6 decks33 decks
18%synergy
Wayfarer's Bauble
15%inclusion5 decks33 decks
5%synergy
Soldevi Digger
15%inclusion5 decks33 decks
15%synergy
Ruby Medallion
12%inclusion4 decks33 decks
2%synergy
Tel-Jilad Stylus
12%inclusion4 decks33 decks
12%synergy
Lantern of Insight
12%inclusion4 decks33 decks
12%synergy
Sapphire Medallion
12%inclusion4 decks33 decks
4%synergy
Brainstone
12%inclusion4 decks33 decks
12%synergy
Sensei's Divining Top
9.1%inclusion3 decks33 decks
2%synergy
Mithril Coat
9.1%inclusion3 decks33 decks
5%synergy
Wand of Wonder
9.1%inclusion3 decks33 decks
6%synergy
Expedition Map
9.1%inclusion3 decks33 decks
8%synergy
The Temporal Anchor
6.1%inclusion2 decks33 decks
6%synergy
Darksteel Pendant
6.1%inclusion2 decks33 decks
6%synergy
Ring of Evos Isle
6.1%inclusion2 decks33 decks
6%synergy
The Key to the Vault
6.1%inclusion2 decks33 decks
5%synergy
Enchantments
Curiosity
52%inclusion17 decks33 decks
27%synergy
Triple Triad
33%inclusion1 decks3 decks
32%synergy
Sneak Attack
30%inclusion10 decks33 decks
30%synergy
Ophidian Eye
27%inclusion9 decks33 decks
13%synergy
Netherese Puzzle-Ward
24%inclusion8 decks33 decks
23%synergy
Clout of the Dominus
24%inclusion8 decks33 decks
21%synergy
Powerbalance
23%inclusion7 decks31 decks
19%synergy
One with the Multiverse
18%inclusion6 decks33 decks
16%synergy
Aqueous Form
18%inclusion6 decks33 decks
16%synergy
Eyes Everywhere
18%inclusion6 decks33 decks
18%synergy
Propaganda
18%inclusion6 decks33 decks
3%synergy
Thopter Spy Network
9.1%inclusion3 decks33 decks
5%synergy
Sigil of Sleep
9.1%inclusion3 decks33 decks
3%synergy
Mystic Remora
9.1%inclusion3 decks33 decks
-11%synergy
Future Sight
9.1%inclusion3 decks33 decks
8%synergy
Frontline Heroism
7.1%inclusion1 decks14 decks
7%synergy
Counterbalance
6.1%inclusion2 decks33 decks
5%synergy
Wizard Class
6.1%inclusion2 decks33 decks
-2%synergy
Impact Tremors
6.1%inclusion2 decks33 decks
-2%synergy
Improbable Alliance
6.1%inclusion2 decks33 decks
5%synergy
Thousand-Year Storm
6.1%inclusion2 decks33 decks
-10%synergy
Swindler's Scheme
6.1%inclusion2 decks33 decks
6%synergy
Battles
Invasion of Segovia
21%inclusion7 decks33 decks
20%synergy
Planeswalkers
Saheeli, Sublime Artificer
42%inclusion14 decks33 decks
35%synergy
Lukka, Coppercoat Outcast
15%inclusion5 decks33 decks
15%synergy
Jace, the Mind Sculptor
15%inclusion5 decks33 decks
14%synergy
Ral, Crackling Wit
7.1%inclusion2 decks28 decks
-5%synergy
Rowan, Scholar of Sparks
6.1%inclusion2 decks33 decks
4%synergy
Utility Lands
Ghost Quarter
64%inclusion21 decks33 decks
62%synergy
Kher Keep
55%inclusion18 decks33 decks
53%synergy
Reliquary Tower
48%inclusion16 decks33 decks
0%synergy
Volatile Fault
39%inclusion13 decks33 decks
38%synergy
Restless Spire
36%inclusion12 decks33 decks
32%synergy
Trenzalore Clocktower
36%inclusion12 decks33 decks
36%synergy
Sokenzan, Crucible of Defiance
36%inclusion12 decks33 decks
33%synergy
Castle Vantress
33%inclusion11 decks33 decks
29%synergy
Otawara, Soaring City
18%inclusion6 decks33 decks
0%synergy
Dwarven Mine
15%inclusion5 decks33 decks
14%synergy
Rogue's Passage
15%inclusion5 decks33 decks
2%synergy
Halimar Depths
12%inclusion4 decks33 decks
9%synergy
Ominous Cemetery
9.1%inclusion3 decks33 decks
9%synergy
Den of the Bugbear
9.1%inclusion3 decks33 decks
9%synergy
Madblind Mountain
6.1%inclusion2 decks33 decks
6%synergy
Mystic Sanctuary
6.1%inclusion2 decks33 decks
-19%synergy
Urza's Saga
6.1%inclusion2 decks33 decks
-2%synergy
Soldevi Excavations
6.1%inclusion2 decks33 decks
6%synergy
War Room
6.1%inclusion2 decks33 decks
5%synergy
Command Beacon
6.1%inclusion2 decks33 decks
2%synergy
Desolate Lighthouse
6.1%inclusion2 decks33 decks
-4%synergy
Moonring Island
6.1%inclusion2 decks33 decks
6%synergy
Temple of the False God
6.1%inclusion2 decks33 decks
-3%synergy
Mana Artifacts
Arcane Signet
97%inclusion32 decks33 decks
14%synergy
Sol Ring
94%inclusion31 decks33 decks
8%synergy
Talisman of Creativity
70%inclusion23 decks33 decks
16%synergy
Izzet Signet
67%inclusion22 decks33 decks
9%synergy
Fellwar Stone
42%inclusion14 decks33 decks
11%synergy
Thought Vessel
36%inclusion12 decks33 decks
0%synergy
Cursed Mirror
30%inclusion10 decks33 decks
23%synergy
Mind Stone
24%inclusion8 decks33 decks
0%synergy
Sonic Screwdriver
12%inclusion4 decks33 decks
11%synergy
Vessel of Endless Rest
9.1%inclusion3 decks33 decks
9%synergy
Lantern of Revealing
6.1%inclusion2 decks33 decks
6%synergy
Mox Amber
6.1%inclusion2 decks33 decks
-4%synergy
Decanter of Endless Water
6.1%inclusion2 decks33 decks
-4%synergy
Liquimetal Torque
6.1%inclusion2 decks33 decks
2%synergy
Midnight Clock
6.1%inclusion2 decks33 decks
-5%synergy
Lands
Mountain
100%inclusion33 decks33 decks
3%synergy
Island
100%inclusion33 decks33 decks
2%synergy
Command Tower
94%inclusion31 decks33 decks
7%synergy
Sulfur Falls
67%inclusion22 decks33 decks
1%synergy
Temple of Epiphany
64%inclusion21 decks33 decks
24%synergy
Demolition Field
61%inclusion20 decks33 decks
58%synergy
Training Center
61%inclusion20 decks33 decks
18%synergy
Shivan Reef
58%inclusion19 decks33 decks
-2%synergy
Stormcarved Coast
58%inclusion19 decks33 decks
17%synergy
Frostboil Snarl
55%inclusion18 decks33 decks
11%synergy
Steam Vents
45%inclusion15 decks33 decks
-3%synergy
Sundering Eruption
45%inclusion14 decks31 decks
40%synergy
Exotic Orchard
42%inclusion14 decks33 decks
9%synergy
Scalding Tarn
39%inclusion13 decks33 decks
8%synergy
Cascade Bluffs
39%inclusion13 decks33 decks
-4%synergy
Fiery Islet
36%inclusion12 decks33 decks
10%synergy
Izzet Boilerworks
33%inclusion11 decks33 decks
-5%synergy
Myriad Landscape
27%inclusion9 decks33 decks
11%synergy
Ferrous Lake
24%inclusion8 decks33 decks
-1%synergy
Riverpyre Verge
20%inclusion1 decks5 decks
-2%synergy
Sink into Stupor
19%inclusion6 decks31 decks
2%synergy
Evolving Wilds
18%inclusion6 decks33 decks
1%synergy
Thundering Falls
18%inclusion6 decks33 decks
-3%synergy
Riverglide Pathway
15%inclusion5 decks33 decks
-9%synergy
Volcanic Island
12%inclusion4 decks33 decks
-3%synergy
Terramorphic Expanse
9.1%inclusion3 decks33 decks
-3%synergy
Pinnacle Monk
6.9%inclusion2 decks29 decks
-6%synergy
Silverbluff Bridge
6.1%inclusion2 decks33 decks
-4%synergy
Fabled Passage
6.1%inclusion2 decks33 decks
-3%synergy
Sea Gate Restoration
6.1%inclusion2 decks33 decks
-2%synergy
Mirrex
6.1%inclusion2 decks33 decks
6%synergy
Reflecting Pool
6.1%inclusion2 decks33 decks
1%synergy
Song-Mad Treachery
6.1%inclusion2 decks33 decks
5%synergy
Plaza of Heroes
6.1%inclusion2 decks33 decks
4%synergy
Opal Palace
6.1%inclusion2 decks33 decks
5%synergy
Path of Ancestry
6.1%inclusion2 decks33 decks
-8%synergy
Spirebluff Canal
6.1%inclusion2 decks33 decks
-9%synergy
Crystal Grotto
6.1%inclusion2 decks33 decks
6%synergy
City of Brass
6.1%inclusion2 decks33 decks
-2%synergy
Valakut Awakening
6.1%inclusion2 decks33 decks
-3%synergy
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