With the release of C16, he took his first step towards that goal, with the dawn of partner. Now, for the first time, he could have not one, but TWO commanders.
Then, with the release of IKO, another great leap forward for all mankind: companion! With companion, he could finally achieve 3 commanders at the same time.
But it was not enough - so many companions couldn't be used, so many color combinations unable to wield the power of the mythical third commander. Plus a lot of the C16 partners were kinda flavorless tbh.
But now, at long last, with the release of commander legends, we have more options than ever, with more possibilities for synergies. But with this brave new frontier, things have gotten far more complicated. What combinations CAN allow for the third commander? Use this as a reference to find out!
Visual reference (credit to @darrenhabib)
Gyruda, Doom of Depths
Obosh, the Preypiercer
SPOILER
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-OR-
Can be partnered with
*Please note that The Prismatic Piper feature in both options but obviously can't be duplicated.
Kaheera, the Orphanguard
Lurrus of the Dream-Den
Umori, the Collector
SPOILER
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Can be partnered with
*Please note that The Prismatic Piper, Reyhan, Last of the Abzan, Ikra Shidiqi, the Usurper feature in both options but obviously can't be duplicated.
-OR-
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Keruga, the Macrosage
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Zirda, the Dawnwaker
Yorion, Sky Nomad
Can't be used as a companion.
Jegantha, the Wellspring
Can't be used with any partner combination.
Lutri, the Spellchaser
Banned.
Bonus info - How popular are these partners on EDHrec right now (because for some dumb reason the set tab doesn't match the actual number, and also doesn't sort them which is very annoying)SPOILER
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Sakashima of a Thousand Faces - 251
Rograkh, Son of Rohgahh - 242
Kodama of the East Tree - 120
Krark, the Thumbless - 118
Malcolm, Keen-Eyed Navigator - 112
Ardenn, Intrepid Archaeologist - 107
Toggo, Goblin Weaponsmith - 87
Tormod, the Desecrator - 84
Jeska, Thrice Reborn - 81
Tevesh Szat, Doom of Fools - 77
Akroma, Vision of Ixidor - 65
Kamahl, Heart of Krosa - 62
Breeches, Brazen Plunderer - 62
Dargo, the Shipwrecker - 60
Eligeth, Crossroads Augur - 59
Ich-Tekik, Salvage Splicer - 55
Rebbec, Architect of Ascension - 45
Miara, Thorn of the Glade - 40
Kediss, Emberclaw Familiar - 39
Keskit, the Flesh Sculptor - 33
Numa, Joraga Chieftain - 32
Livio, Oathsworn Sentinel - 32
Armix, Filigree Thrasher - 31
Keleth, Sunmane Familiar - 28
Siani, Eye of the Storm - 28
Nadier, Agent of the Duskenel - 26
Alena, Kessig Trapper - 25
Prava of the Steel Legion - 23
Ghost of Ramirez DePietro - 23
Gilanra, Caller of Wirewood - 23
Slurrk, All-Ingesting - 20
Esior, Wardwing Familiar - 20
Sengir, the Dark Baron - 17
Brinelin, the Moon Kraken - 16
Halana, Kessig Ranger - 15
Glacian, Powerstone Engineer - 14
Falthis, Shadowcat Familiar - 14
Alharu, Solemn Ritualist - 11
Anara, Wolvid Familiar - 10
Radiant, Serra Archangel - 6
The Prismatic Piper - 0
Rograkh, Son of Rohgahh - 242
Kodama of the East Tree - 120
Krark, the Thumbless - 118
Malcolm, Keen-Eyed Navigator - 112
Ardenn, Intrepid Archaeologist - 107
Toggo, Goblin Weaponsmith - 87
Tormod, the Desecrator - 84
Jeska, Thrice Reborn - 81
Tevesh Szat, Doom of Fools - 77
Akroma, Vision of Ixidor - 65
Kamahl, Heart of Krosa - 62
Breeches, Brazen Plunderer - 62
Dargo, the Shipwrecker - 60
Eligeth, Crossroads Augur - 59
Ich-Tekik, Salvage Splicer - 55
Rebbec, Architect of Ascension - 45
Miara, Thorn of the Glade - 40
Kediss, Emberclaw Familiar - 39
Keskit, the Flesh Sculptor - 33
Numa, Joraga Chieftain - 32
Livio, Oathsworn Sentinel - 32
Armix, Filigree Thrasher - 31
Keleth, Sunmane Familiar - 28
Siani, Eye of the Storm - 28
Nadier, Agent of the Duskenel - 26
Alena, Kessig Trapper - 25
Prava of the Steel Legion - 23
Ghost of Ramirez DePietro - 23
Gilanra, Caller of Wirewood - 23
Slurrk, All-Ingesting - 20
Esior, Wardwing Familiar - 20
Sengir, the Dark Baron - 17
Brinelin, the Moon Kraken - 16
Halana, Kessig Ranger - 15
Glacian, Powerstone Engineer - 14
Falthis, Shadowcat Familiar - 14
Alharu, Solemn Ritualist - 11
Anara, Wolvid Familiar - 10
Radiant, Serra Archangel - 6
The Prismatic Piper - 0
text version
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can't be used as a companion.
(Eligeth, Crossroads Augur /Brinelin, the Moon Kraken /Esior, Wardwing Familiar /Glacian, Powerstone Engineer /Kydele, Chosen of Kruphix /Ishai, Ojutai Dragonspeaker /Sakashima of a Thousand Faces /Siani, Eye of the Storm /Thrasios, Triton Hero )
+
(Miara, Thorn of the Glade /Nadier, Agent of the Duskenel /Sengir, the Dark Baron /Tormod, the Desecrator )
Vial Smasher the Fierce + any odd partner
or
(Alena, Kessig Trapper /Dargo, the Shipwrecker /Jeska, Thrice Reborn /Kraum, Ludevic's Opus /Ludevic, Necro-Alchemist /Toggo, Goblin Weaponsmith )
+
(Armix, Filigree Thrasher /Falthis, Shadowcat Familiar /Ikra Shidiqi, the Usurper /Keskit, the Flesh Sculptor /Ravos, Soultender /Reyhan, Last of the Abzan /Silas Renn, Seeker Adept /Tevesh Szat, Doom of Fools /Tymna the Weaver )
can't be used with any partner combination
Anara, Wolvid Familiar
+
Prava of the Steel Legion
Miara, Thorn of the Glade
+
(Livio, Oathsworn Sentinel /Keleth, Sunmane Familiar /Akiri, Line-Slinger )
any BG combination except Tevesh Szat, Doom of Fools. Also of note, there is no artifact partner combination; creature is the only type option.
any U+G combination except Thrasios, Triton Hero and Esior, Wardwing Familiar.
or
CMC 3+ Non-UG partners can be used in combination with Kydele, Chosen of Kruphix.
or
Haldan, Avid Arcanist + Pako, Arcane Retriever
or
Cazur, Ruthless Stalker + Ukkima, Stalking Shadow
Banned.
(Alena, Kessig Trapper /Jeska, Thrice Reborn )
+
(Livio, Oathsworn Sentinel /Prava of the Steel Legion /Radiant, Serra Archangel )
or
Brallin, Skyshark Rider + Shabraz, the Skyshark