The first lot only took a couple of months to identify the issues, and then no more than a couple more to have done enough design work to feel like they might be solved, this time round it is about half the pace, and so I don't expect to be in any place to make the third order until summer this year, and from then it is likely going to be winter again before I am settled on a final 612 and that final load of cards are sufficiently tested

Altered Ego Auton Soldier Callidus Assassin Clever Impersonator Clone Copy Artifact Copy Enchantment Copy Land Copycrook Dack's Duplicate Evil Twin Flesh Duplicate Gigantoplasm Jwari Shapeshifter Machine God's Effigy Masterwork of Ingenuity Mirrorhall Mimic Mirrormade Mockingbird Naga Fleshcrafter Omni-Changeling Phantasmal Image Phyrexian Metamorph Pirated Copy Progenitor Mimic Protean Raider Quicksilver Gargantuan Sakashima the Impostor Sakashima's Protege Sakashima's Student Sculpting Steel Stunt Double Synth Infiltrator Undercover Operative Vesuva Vesuvan Doppelganger Vizier of Many Faces Wall of Stolen Identity
Then, take a look at our best Disney Lorcana: The First Chapter Starter Decks article
It has a narrow window to interact with and puts a clock on your opponents, especially when paired with effects like Sanguine Bond and Bloodletter of Aclazotz
Barring some outliers over the years, Precons were at a somewhat steady powerlevel until more recently
In: Reveillark, replaces Pinnacle Monk Flip In: Panharmonicon, replaces Blade of Selves for ETB triggers In: Felidar Guardian for infinite token combo with Kiki-Jiki, Mirror Breaker