Wanderwine Prophets is a one card combo for repeatable extra turns with Inalla, Archmage Ritualist in the command zone.
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Cast the original and pay to make a copy with Inalla's eminence ability
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Champion the original with the copy
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Attack with the hasted copy
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Sacrifice the first copy to its combat effect
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Return the original and pay to make a second copy with Inalla's eminence ability
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Champion the original again with the second copy
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Exile the second copy at the beginning of the end step
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Return the original and pay to make a third copy with Inalla's eminence ability
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Champion the original again with the third copy
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The third copy will last until the next turn's end step, so it can attack during the extra turn to continue the cycle.
However, this requires 9 mana and at least one opponent with no blockers, and doesn't give any more turns once the opponents with no blockers are defeated. Panharmonicon and Naban, Dean of Iteration will also prevent this combo as the championing triggers multiple times with insufficient merfolk to exile.
Riptide Director provides a repeatable Distant Melody but can be a very heavy upfront investment to use immediately. Azami, Lady of Scrolls also draws the same number but requires tapping Wizards, which can be a negligible cost with Paradox Engine. Vedalken AEthermage finds any other Wizard. Vedalken Archmage can draw multiple cards with cheap artifacts to play. Seafloor Oracle can draw quite a few cards if multiple copies or other Merfolk go unblocked. Corpse Augur works well against creature-heavy decks but needs to die rather than get exiled.
Dire Fleet Ravager can quickly bring all players down to less than half their life, which helps an aggro deck but can also be a double-edged sword. Ghitu Journeymage only hurts opponents.
Voidmage Prodigy and Patron Wizard can counter problematic spells. Mizzium Meddler can protect other permanents depending on the spell or ability.
Galecaster Colossus bounces any problematic permanents. Beguiler of Wills can steal quite a few creatures when copied with Inalla, Archmage Ritualist or Flameshadow Conjuring, or untapped by Paradox Engine.
Minion Reflector can make even more copies of creatures, which generates more mana than it uses with Mana Echoes. Strionic Resonator is cheaper to cast and can copy Inalla's eminence or other triggers but only works once a turn. Mirrorworks can copy creatures permanently with Mycosynth Lattice, and also copy Panharmonicon.
Mirror Gallery is really fun since it allows multiple copies of Naban to coexist, especially with Cloudstone Curio or Venser, Shaper Savant to bounce the original Naban and replay him to make even more copies, since each new copy of Naban triggers Ambuscade Shaman, Boltwing Marauder, Ogre Battledriver, In the Web of War, and Warstorm Surge an additional time.
Sundial of the Infinite turns the temporary hasty tokens from Inalla, Archmage Ritualist, Flameshadow Conjuring, and Twinflame into permanent tokens, although this deck doesn't usually need the tokens for more than a turn.
Quicksilver Gargantuan can make multiple bigger copies of Wizards, which is helpful for cloning Disciple of Bolas, Champion of Wits, Dreamstealer, Cephalid Constable, or Profaner of the Dead, and providing fodder for Ghoulcaller Gisa.
Polymorphous Rush can turn other creatures into copies of Ambuscade Shaman or Boltwing Marauder, or Naban, Dean of Iteration with Mirror Gallery, since just a few of them can make any subsequent Wizards lethal with Warstorm Surge.
Intruder Alarm and Faces of the Past can untap Wizards for more activated abilities.
Kindred Dominance should assure the dominance of Wizards on the battlefield.
Dowsing Dagger
could be good for ramp with small aggressive Wizards.
Urza's Incubator provides cost reduction to cast more Wizards each turn.
Whip of Erebos provides lifelink for racing and can recur Wizards from the grave while making hasty tokens.
Shared Animosity can increase the power of Wizards (and Zombies, Elementals, Orcs, Ogres, Dragons) if they attack together, but doesn't apply when entering the battlefield for cards like Disciple of Bolas, Champion of Wits, Profaner of the Dead, and Warstorm Surge.
Jhoira of the Ghitu can set up several of the more expensive permanents for a very explosive turn later on. Magus of the Mind and its tokens can also create Wizard armies out of nowhere, especially with cheap mana rocks or Paradox Engine to increase the storm count.
Arcane Adaptation, Xenograft, and Conspiracy could enable more creatures to benefit from Naban, Dean of Iteration and Inalla, Archmage Ritualist. Boltwing Marauder would become the Dragon Wizard it was meant to be, just like Dragon Mage. This would allow for a lot more copies of Ambuscade Shaman and Ogre Battledriver on the critical turn.
Good creatures to turn into Wizards for their effects are Gray Merchant of Asphodel, Massacre Wurm, Doomwake Giant, Phyrexian Ingester, Duplicant, Noxious Gearhulk, Sepulchral Primordial, Diluvian Primordial, Molten Primordial, Zealous Conscripts, Faerie Artisans, Rishadan Brigand, Thought-Knot Seer, Deepglow Skate, Palinchron, Godo, Bandit Warlord, Flamerush Rider, Siege-Gang Commander, Grave Titan, Rapacious One, Utvara Hellkite, Rune-Scarred Demon, Unesh, Criosphinx Sovereign, and Sphinx of Uthuun. Worldgorger Dragon would also exile all our other creatures and then the token from Inalla would exile the original bringing back the exiled creatures to repeat their effects and allow more copying by Inalla.
Adeliz, the Cinder Wind and Docent of Perfection
would be good in a version of this deck with more instants and sorceries, especially low CMC ones, along with Spellseeker, Jori En, Ruin Diver, Mizzix of the Izmagnus, Goblin Electromancer, Primal Amulet
, and Pyromancer's Goggles.
For similar decks, check out my Theros-Tarkir Standard deck Ambuscadewing Rabblementor, the 5C EDH upgrade of that Standard deck Valor in the Primal Web of Warstorm Crusade, my artifact copying and Panharmonicon-abusing deck Breya, Equipment Shapers Inc., and my Zur's Tribal Tribal deck with Wizards that are also Spirit Vampire Myr Sliver Zombie Knight Allies.