River Song (Commander) - Polymorph

River Song
Rank #662
21decks
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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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Proteus Staff
95%inclusion20 decks21 decks
95%synergy
Transmogrify
95%inclusion20 decks21 decks
95%synergy
Polymorph
95%inclusion20 decks21 decks
95%synergy
Reality Scramble
81%inclusion17 decks21 decks
80%synergy
Field of Ruin
81%inclusion17 decks21 decks
79%synergy
Ghost Quarter
76%inclusion16 decks21 decks
75%synergy
Neera, Wild Mage
76%inclusion16 decks21 decks
74%synergy
Divergent Transformations
71%inclusion15 decks21 decks
70%synergy
The Reality Chip
67%inclusion14 decks21 decks
62%synergy
Junktroller
62%inclusion13 decks21 decks
61%synergy
Top Cards
Brainstorm
76%inclusion16 decks21 decks
34%synergy
Lightning Greaves
76%inclusion16 decks21 decks
51%synergy
Chaos Warp
71%inclusion15 decks21 decks
31%synergy
Niv-Mizzet, Parun
62%inclusion13 decks21 decks
37%synergy
Etali, Primal Storm
62%inclusion13 decks21 decks
57%synergy
Ovika, Enigma Goliath
62%inclusion13 decks21 decks
56%synergy
Timestream Navigator
62%inclusion13 decks21 decks
61%synergy
Curiosity
62%inclusion13 decks21 decks
38%synergy
Swiftfoot Boots
57%inclusion12 decks21 decks
28%synergy
Krenko's Buzzcrusher
57%inclusion12 decks21 decks
56%synergy
Game Changers
Consecrated Sphinx
43%inclusion9 decks21 decks
40%synergy
Jeska's Will
38%inclusion8 decks21 decks
9%synergy
Cyclonic Rift
29%inclusion6 decks21 decks
5%synergy
Rhystic Study
24%inclusion5 decks21 decks
1%synergy
Gamble
24%inclusion5 decks21 decks
7%synergy
Mystical Tutor
24%inclusion5 decks21 decks
3%synergy
Fierce Guardianship
19%inclusion4 decks21 decks
-2%synergy
Creatures
Fin Fang Foom
100%inclusion1 decks1 decks
100%synergy
Third Path Iconoclast
57%inclusion12 decks21 decks
42%synergy
Transplant Theorist
52%inclusion11 decks21 decks
51%synergy
Harmonized Trio
50%inclusion1 decks2 decks
47%synergy
Young Pyromancer
48%inclusion10 decks21 decks
33%synergy
Ancient Silver Dragon
48%inclusion10 decks21 decks
45%synergy
Tomb Trawler
48%inclusion10 decks21 decks
47%synergy
Talrand, Sky Summoner
48%inclusion10 decks21 decks
34%synergy
Jin-Gitaxias, Progress Tyrant
48%inclusion10 decks21 decks
46%synergy
Hullbreaker Horror
43%inclusion9 decks21 decks
35%synergy
Magmatic Hellkite
40%inclusion2 decks5 decks
39%synergy
Jalira, Master Polymorphist
38%inclusion8 decks21 decks
38%synergy
Fireflux Squad
33%inclusion7 decks21 decks
33%synergy
Wan Shi Tong, Librarian
33%inclusion1 decks3 decks
31%synergy
Thassa, God of the Sea
29%inclusion6 decks21 decks
28%synergy
Nezahal, Primal Tide
29%inclusion6 decks21 decks
27%synergy
The Locust God
29%inclusion6 decks21 decks
21%synergy
Blightsteel Colossus
29%inclusion6 decks21 decks
26%synergy
Matoya, Archon Elder
25%inclusion1 decks4 decks
25%synergy
Tellah, Great Sage
25%inclusion1 decks4 decks
22%synergy
Sandworm
25%inclusion1 decks4 decks
25%synergy
Marang River Regent
20%inclusion1 decks5 decks
19%synergy
Jade-Cast Sentinel
20%inclusion1 decks5 decks
20%synergy
Niv-Mizzet, Visionary
20%inclusion3 decks15 decks
9%synergy
Barkform Harvester
19%inclusion4 decks21 decks
18%synergy
Utvara Hellkite
19%inclusion4 decks21 decks
18%synergy
Drakuseth, Maw of Flames
19%inclusion4 decks21 decks
17%synergy
Myr Custodian
19%inclusion4 decks21 decks
19%synergy
Sphinx of the Second Sun
19%inclusion4 decks21 decks
18%synergy
Goblin Electromancer
19%inclusion4 decks21 decks
-8%synergy
Storm-Kiln Artist
19%inclusion4 decks21 decks
-20%synergy
Baral and Kari Zev
14%inclusion3 decks21 decks
12%synergy
Eager Construct
14%inclusion3 decks21 decks
14%synergy
Octavia, Living Thesis
14%inclusion3 decks21 decks
13%synergy
Boldwyr Heavyweights
14%inclusion3 decks21 decks
14%synergy
Noble Benefactor
14%inclusion3 decks21 decks
14%synergy
Hired Giant
14%inclusion3 decks21 decks
14%synergy
Magnus the Red
14%inclusion3 decks21 decks
12%synergy
Jin-Gitaxias, Core Augur
14%inclusion3 decks21 decks
13%synergy
Displacer Kitten
10%inclusion2 decks21 decks
6%synergy
Tandem Lookout
10%inclusion2 decks21 decks
-3%synergy
Tidespout Tyrant
10%inclusion2 decks21 decks
9%synergy
Ancient Copper Dragon
10%inclusion2 decks21 decks
7%synergy
Pathrazer of Ulamog
10%inclusion2 decks21 decks
9%synergy
Soldier of Fortune
10%inclusion2 decks21 decks
9%synergy
Stormcatch Mentor
10%inclusion2 decks21 decks
-13%synergy
Canal Dredger
10%inclusion2 decks21 decks
9%synergy
Twinflame Tyrant
6.7%inclusion1 decks15 decks
4%synergy
Instants
HULK SMASH!
100%inclusion1 decks1 decks
99%synergy
Counterspell
57%inclusion12 decks21 decks
5%synergy
Spell Crumple
57%inclusion12 decks21 decks
56%synergy
Guff Rewrites History
52%inclusion11 decks21 decks
51%synergy
Double Jump // Flying Kick
50%inclusion1 decks2 decks
50%synergy
Chaos Mutation
43%inclusion9 decks21 decks
41%synergy
An Offer You Can't Refuse
38%inclusion8 decks21 decks
0%synergy
Arcane Denial
38%inclusion8 decks21 decks
8%synergy
Invert Polarity
33%inclusion7 decks21 decks
22%synergy
Swan Song
33%inclusion7 decks21 decks
11%synergy
Giantfall
33%inclusion1 decks3 decks
33%synergy
Pongify
29%inclusion6 decks21 decks
1%synergy
Rapid Hybridization
29%inclusion6 decks21 decks
11%synergy
Experimental Augury
29%inclusion6 decks21 decks
27%synergy
Opt
29%inclusion6 decks21 decks
-5%synergy
Impulse
29%inclusion6 decks21 decks
24%synergy
Anticipate
24%inclusion5 decks21 decks
22%synergy
Telling Time
19%inclusion4 decks21 decks
18%synergy
Negate
19%inclusion4 decks21 decks
-12%synergy
Wild Magic Surge
19%inclusion4 decks21 decks
16%synergy
Synthetic Destiny
19%inclusion4 decks21 decks
19%synergy
Slip Out the Back
19%inclusion4 decks21 decks
13%synergy
Sink into Stupor
19%inclusion4 decks21 decks
1%synergy
Dig Through Time
19%inclusion4 decks21 decks
7%synergy
Zoyowa's Justice
14%inclusion3 decks21 decks
14%synergy
Deliberate
14%inclusion3 decks21 decks
13%synergy
Brainsurge
14%inclusion3 decks21 decks
10%synergy
Deflecting Swat
14%inclusion3 decks21 decks
-7%synergy
Blessed Reincarnation
14%inclusion3 decks21 decks
14%synergy
Muddle the Mixture
10%inclusion2 decks21 decks
-1%synergy
Frantic Search
10%inclusion2 decks21 decks
-32%synergy
Cyber Conversion
10%inclusion2 decks21 decks
9%synergy
Audacious Swap
10%inclusion2 decks21 decks
9%synergy
Lightning Bolt
10%inclusion2 decks21 decks
-19%synergy
Reality Shift
10%inclusion2 decks21 decks
-4%synergy
Mana Drain
10%inclusion2 decks21 decks
-7%synergy
Condescend
10%inclusion2 decks21 decks
9%synergy
Peer Through Depths
10%inclusion2 decks21 decks
9%synergy
Abrade
10%inclusion2 decks21 decks
-11%synergy
Delightful Discovery
7.1%inclusion1 decks14 decks
7%synergy
Bulk Up
7.1%inclusion1 decks14 decks
4%synergy
Sorceries
Avengers Disassembled
100%inclusion1 decks1 decks
99%synergy
Nova Flame
100%inclusion1 decks1 decks
100%synergy
Price of Freedom
67%inclusion2 decks3 decks
66%synergy
Sundering Eruption
62%inclusion13 decks21 decks
56%synergy
From the Ashes
52%inclusion11 decks21 decks
52%synergy
Mystic Speculation
52%inclusion11 decks21 decks
52%synergy
Blasphemous Act
48%inclusion10 decks21 decks
9%synergy
Dream Cache
48%inclusion10 decks21 decks
47%synergy
Ingenious Mastery
43%inclusion9 decks21 decks
42%synergy
Cleansing Wildfire
38%inclusion8 decks21 decks
37%synergy
Preordain
38%inclusion8 decks21 decks
5%synergy
Serum Visions
33%inclusion7 decks21 decks
18%synergy
Mega Flare
33%inclusion1 decks3 decks
33%synergy
Expressive Iteration
29%inclusion6 decks21 decks
5%synergy
Memories Returning
25%inclusion1 decks4 decks
24%synergy
Systems Override
25%inclusion1 decks4 decks
25%synergy
Geomancer's Gambit
24%inclusion5 decks21 decks
23%synergy
Mana Geyser
24%inclusion5 decks21 decks
0%synergy
Mass Polymorph
24%inclusion5 decks21 decks
24%synergy
Nanogene Conversion
24%inclusion5 decks21 decks
23%synergy
Indomitable Creativity
24%inclusion5 decks21 decks
23%synergy
Ponder
19%inclusion4 decks21 decks
-17%synergy
Windfall
19%inclusion4 decks21 decks
-5%synergy
Role Reversal
19%inclusion4 decks21 decks
18%synergy
Chain Reaction
14%inclusion3 decks21 decks
9%synergy
Vandalblast
14%inclusion3 decks21 decks
-10%synergy
Song of Totentanz
14%inclusion3 decks21 decks
12%synergy
Rally at the Hornburg
14%inclusion3 decks21 decks
14%synergy
Chaotic Transformation
14%inclusion3 decks21 decks
14%synergy
Bonfire of the Damned
10%inclusion2 decks21 decks
9%synergy
Flood of Tears
10%inclusion2 decks21 decks
9%synergy
Mizzix's Mastery
10%inclusion2 decks21 decks
-9%synergy
Enter the Enigma
10%inclusion2 decks21 decks
3%synergy
Day's Undoing
10%inclusion2 decks21 decks
9%synergy
Song-Mad Treachery
10%inclusion2 decks21 decks
9%synergy
Krenko's Command
10%inclusion2 decks21 decks
8%synergy
Dragon Fodder
10%inclusion2 decks21 decks
8%synergy
Forbidden Friendship
10%inclusion2 decks21 decks
9%synergy
Solve the Equation
10%inclusion2 decks21 decks
-3%synergy
Lunar Insight
7.1%inclusion1 decks14 decks
6%synergy
Utility Artifacts
Reito Lantern
57%inclusion12 decks21 decks
57%synergy
Scroll Rack
43%inclusion9 decks21 decks
41%synergy
Palantír of Orthanc
43%inclusion9 decks21 decks
42%synergy
Conjurer's Bauble
29%inclusion6 decks21 decks
27%synergy
Crystal Ball
29%inclusion6 decks21 decks
28%synergy
Treasure Map
24%inclusion5 decks21 decks
23%synergy
Goblin Charbelcher
19%inclusion4 decks21 decks
19%synergy
Ruby Medallion
14%inclusion3 decks21 decks
4%synergy
Wayfarer's Bauble
14%inclusion3 decks21 decks
6%synergy
Darksteel Pendant
14%inclusion3 decks21 decks
14%synergy
River Song's Diary
14%inclusion3 decks21 decks
13%synergy
Soldevi Digger
14%inclusion3 decks21 decks
14%synergy
Lantern of Insight
14%inclusion3 decks21 decks
14%synergy
Sapphire Medallion
14%inclusion3 decks21 decks
5%synergy
Sensei's Divining Top
10%inclusion2 decks21 decks
2%synergy
Mithril Coat
10%inclusion2 decks21 decks
6%synergy
Tel-Jilad Stylus
10%inclusion2 decks21 decks
9%synergy
Wand of Wonder
10%inclusion2 decks21 decks
7%synergy
TARDIS
10%inclusion2 decks21 decks
9%synergy
Brainstone
10%inclusion2 decks21 decks
9%synergy
Enchantments
Sneak Attack
33%inclusion7 decks21 decks
33%synergy
Clout of the Dominus
29%inclusion6 decks21 decks
26%synergy
Ophidian Eye
29%inclusion6 decks21 decks
15%synergy
Triple Triad
25%inclusion1 decks4 decks
24%synergy
Aqueous Form
24%inclusion5 decks21 decks
21%synergy
Netherese Puzzle-Ward
24%inclusion5 decks21 decks
23%synergy
Eyes Everywhere
24%inclusion5 decks21 decks
23%synergy
Powerbalance
19%inclusion4 decks21 decks
16%synergy
One with the Multiverse
14%inclusion3 decks21 decks
11%synergy
Sigil of Sleep
14%inclusion3 decks21 decks
9%synergy
Thopter Spy Network
10%inclusion2 decks21 decks
6%synergy
Future Sight
10%inclusion2 decks21 decks
9%synergy
Improbable Alliance
10%inclusion2 decks21 decks
8%synergy
Psychic Surgery
10%inclusion2 decks21 decks
9%synergy
Brimstone Roundup
10%inclusion2 decks21 decks
9%synergy
Propaganda
10%inclusion2 decks21 decks
-5%synergy
Frontline Heroism
6.7%inclusion1 decks15 decks
7%synergy
Battles
Invasion of Segovia
24%inclusion5 decks21 decks
23%synergy
Planeswalkers
Saheeli, Sublime Artificer
48%inclusion10 decks21 decks
41%synergy
Jace, the Mind Sculptor
19%inclusion4 decks21 decks
18%synergy
Lukka, Coppercoat Outcast
14%inclusion3 decks21 decks
14%synergy
Utility Lands
Rivendell
57%inclusion12 decks21 decks
54%synergy
Volatile Fault
52%inclusion11 decks21 decks
51%synergy
Reliquary Tower
52%inclusion11 decks21 decks
4%synergy
Kher Keep
48%inclusion10 decks21 decks
46%synergy
Trenzalore Clocktower
38%inclusion8 decks21 decks
37%synergy
Sokenzan, Crucible of Defiance
33%inclusion7 decks21 decks
30%synergy
Castle Vantress
33%inclusion7 decks21 decks
29%synergy
Restless Spire
29%inclusion6 decks21 decks
23%synergy
Otawara, Soaring City
14%inclusion3 decks21 decks
-4%synergy
Mystic Sanctuary
10%inclusion2 decks21 decks
-17%synergy
Halimar Depths
10%inclusion2 decks21 decks
7%synergy
Ominous Cemetery
10%inclusion2 decks21 decks
9%synergy
Rogue's Passage
10%inclusion2 decks21 decks
-4%synergy
Mana Artifacts
Arcane Signet
95%inclusion20 decks21 decks
13%synergy
Sol Ring
90%inclusion19 decks21 decks
4%synergy
Izzet Signet
67%inclusion14 decks21 decks
12%synergy
Talisman of Creativity
62%inclusion13 decks21 decks
8%synergy
Fellwar Stone
48%inclusion10 decks21 decks
16%synergy
Cursed Mirror
29%inclusion6 decks21 decks
21%synergy
Thought Vessel
29%inclusion6 decks21 decks
-7%synergy
Mind Stone
14%inclusion3 decks21 decks
-8%synergy
Lantern of Revealing
10%inclusion2 decks21 decks
9%synergy
Vessel of Endless Rest
10%inclusion2 decks21 decks
9%synergy
Decanter of Endless Water
10%inclusion2 decks21 decks
1%synergy
Liquimetal Torque
10%inclusion2 decks21 decks
6%synergy
Sonic Screwdriver
10%inclusion2 decks21 decks
8%synergy
Lands
Mountain
100%inclusion21 decks21 decks
3%synergy
Island
100%inclusion21 decks21 decks
2%synergy
Command Tower
95%inclusion20 decks21 decks
9%synergy
Sulfur Falls
86%inclusion18 decks21 decks
19%synergy
Demolition Field
81%inclusion17 decks21 decks
78%synergy
Stormcarved Coast
76%inclusion16 decks21 decks
32%synergy
Temple of Epiphany
76%inclusion16 decks21 decks
38%synergy
Shivan Reef
67%inclusion14 decks21 decks
7%synergy
Frostboil Snarl
67%inclusion14 decks21 decks
22%synergy
Sundering Eruption
62%inclusion13 decks21 decks
56%synergy
Training Center
62%inclusion13 decks21 decks
20%synergy
Steam Vents
57%inclusion12 decks21 decks
7%synergy
Turbulent Springs
50%inclusion1 decks2 decks
32%synergy
Scorched Geyser
50%inclusion1 decks2 decks
30%synergy
Cascade Bluffs
48%inclusion10 decks21 decks
2%synergy
Fiery Islet
43%inclusion9 decks21 decks
18%synergy
Izzet Boilerworks
38%inclusion8 decks21 decks
4%synergy
Exotic Orchard
38%inclusion8 decks21 decks
4%synergy
Riverpyre Verge
33%inclusion2 decks6 decks
11%synergy
Scalding Tarn
33%inclusion7 decks21 decks
2%synergy
Ferrous Lake
29%inclusion6 decks21 decks
3%synergy
Myriad Landscape
24%inclusion5 decks21 decks
10%synergy
Riverglide Pathway
24%inclusion5 decks21 decks
0%synergy
Thundering Falls
24%inclusion5 decks21 decks
2%synergy
Evolving Wilds
19%inclusion4 decks21 decks
3%synergy
Sink into Stupor
19%inclusion4 decks21 decks
1%synergy
Terramorphic Expanse
10%inclusion2 decks21 decks
-3%synergy
Reflecting Pool
10%inclusion2 decks21 decks
5%synergy
Song-Mad Treachery
10%inclusion2 decks21 decks
9%synergy
Opal Palace
10%inclusion2 decks21 decks
8%synergy
Spirebluff Canal
10%inclusion2 decks21 decks
-5%synergy
Crystal Grotto
10%inclusion2 decks21 decks
9%synergy
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