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Start with Nihil Zero or Mega Symphonia for an affordable first box

The first upgrades Id like to suggest are largely focused on making this deck a little more focused on Squirrel tokens in particular

Brudiclad, Telchor Engineer Genesis Chamber Mirrodin Besieged Myr Matrix Myr Propagator Myr Sire Myr Turbine Myrsmith Origin Spellbomb Parasitic Implant Shrine of Loyal Legions Urtet, Remnant of Memnarch

And hang on are you thinking what Im thinking

You get fewer automatic choices that go in every deck (because you cant always have the best-in-slot), less of a pronounced gap between decks based on color access (because you cant necessarily play every great card in your colors)