Building a Simic double-infinite-combo deck concept using a Simic card draw value shell.
Infinite combo 1 is double Forensic Researcher with infinite untaps with a Deeproot Pilgrimage payoff.
Infinite combo 2 is Invasion of Arcavios
fetching a Doppelgang from the sideboard (even in best of 1) and then duplicating lands and Arcavios to have big mana and fetch more things from the sideboard. Especially Hurkyl's Final Meditation to repeatedly cancel the opponent's turn at every upkeep step.
Draw value shell is Proft's Eidetic Memory with Ingenious Prodigy. Once online you're getting an extra card draw every turn.
Defensive cards are Repulsive Mutation, Lost in the Maze, Vodalian Hexcatcher or whatever you want to pull from the sideboard from Arcavios.
Unctus, Grand Metatect ramps up the card draw, and you can essentially pull anything you want from the library once double Researcher and Unctus are online. Teferi, Temporal Pilgrim can wipe the opponent's board if you can card draw him up to 12 loyalty. Or his spirit tokens leech up the extra card draw value.
Invasion of Segovia
flipped gives convoke for all your noncreature spells. Inga and Esika effectively gives convoke for your creature spells. Elusive Otter can become unblockable fast if you Mutate him. He can pump Prodigies or Kraken tramplers before putting him on the field.
Mindlink Mech gives more Researchers to play with and gives your creatures a quick hexproof out with Lost in the Maze on the field or can give an emergency extra force spike with a Hexcatcher on the field.
Not sure what would be best in the sideboard in Simic colors otherwise. Tandem Takedown and Atraxa's Fall are control cards that can hit battles. Maybe something like March of Swirling Mist is needed to defend against some situations or clear out blockers? Maybe a See Double or Croaking Counterpart to copy a problem creature? I don't think Storm the Festival covers a real need though the deck is generally full of combo pieces that fit the idea, maybe as a rebuild helper after losing your board from some sort of sweeper you couldn't counter?
