Card

Doppelgang

Mana cost {X}{X}{X}{G}{U}

For each of X target permanents, create X tokens that are copies of that permanent.

Part of 51 known combos, 27 of them two-card. 4 official rulings.

Bracket

B1 Exhibition — Not in the same deck as its two-card combo partners: Eternal Witness, Biovisionary, Timeless Witness, Archaeomancer, Skullwinder, Dualcaster Mage, Pinnacle Monk // Mystic Peak, Greenwarden of Murasa, Uyo, Silent Prophet, Reiterate, Naru Meha, Master Wizard, Kairi, the Swirling Sky, Mnemonic Wall, Scholar of the Ages, Shipwreck Dowser, Salvager of Secrets, Ardent Elementalist, Mirror-Mad Phantasm, Izzet Chronarch, Cormela, Glamour Thief, Donnie & April, Adorkable Duo, Possessed Skaab, Revolutionist, Vampire Charmseeker, Warden of the Eye, Returned Pastcaller, Zealous Lorecaster
B2 Core — Not in the same deck as its two-card combo partners: Eternal Witness, Biovisionary, Timeless Witness, Archaeomancer, Skullwinder, Dualcaster Mage, Pinnacle Monk // Mystic Peak, Greenwarden of Murasa, Uyo, Silent Prophet, Reiterate, Naru Meha, Master Wizard, Kairi, the Swirling Sky, Mnemonic Wall, Scholar of the Ages, Shipwreck Dowser, Salvager of Secrets, Ardent Elementalist, Mirror-Mad Phantasm, Izzet Chronarch, Cormela, Glamour Thief, Donnie & April, Adorkable Duo, Possessed Skaab, Revolutionist, Vampire Charmseeker, Warden of the Eye, Returned Pastcaller, Zealous Lorecaster
B3 Upgraded — allowed: Its two-card combos are not early, which Bracket 3 allows
B4 Optimized — allowed: No restriction beyond the banned list
B5 cEDH — allowed: No restriction beyond the banned list

Two-card combo with Eternal Witness, Biovisionary, Timeless Witness, Archaeomancer, Skullwinder, Dualcaster Mage, Pinnacle Monk // Mystic Peak, Greenwarden of Murasa, Uyo, Silent Prophet, Reiterate, Naru Meha, Master Wizard, Kairi, the Swirling Sky, Mnemonic Wall, Scholar of the Ages, Shipwreck Dowser, Salvager of Secrets, Ardent Elementalist, Mirror-Mad Phantasm, Izzet Chronarch, Cormela, Glamour Thief, Donnie & April, Adorkable Duo, Possessed Skaab, Revolutionist, Vampire Charmseeker, Warden of the Eye, Returned Pastcaller, Zealous Lorecaster (none of them early)

Bracket: Lotus Vault analysis, with Commander Spellbook flags

51 known combos, 27 of them two-card.

Doppelgang + Eternal Witness
Produces: Infinite copies of all permanents, Infinite creature tokens, Infinite creature ETB
View on Commander Spellbook
Doppelgang + Biovisionary
Produces: Win the game
View on Commander Spellbook
Doppelgang + Timeless Witness
Produces: Infinite creature ETB, Infinite storm count, Infinite creature tokens
View on Commander Spellbook

2024-02-02 · Wizards of the Coast
If the copied permanent has {X} in its mana cost, X is 0.
2024-02-02 · Wizards of the Coast
If the copied permanent is copying something else, then the tokens enter the battlefield as whatever that permanent copied.
2024-02-02 · Wizards of the Coast
Any enters-the-battlefield abilities of the copied permanent will trigger when the tokens enter the battlefield. Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the permanent will also work.
2024-02-02 · Wizards of the Coast
The tokens copy exactly what was printed on the original permanent and nothing else (unless that permanent is itself copying something else; see below). They don't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.

Rulings: Scryfall · Wizards of the Coast