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Perpetual sabotage with The Foundry (Sierra & Oddball) [Standard]
The deck Putting this deck together was an exercise in reverse-engineering. To start, Sierra needs three copies of Brassbug Hive (R) as her win-condition. She wants to run three copies of Mechanical Training (C) to close out the game with Brassbug Hive, but they also need to not be dead cards before a Brassbug Hive is online. This means including some combination of Armored Jammer, Haven, Bravos Bastion (R), The Foundry, Axiom Bastion (R), Axiom Reprocessor (R), and The Ouroboros, Lyra Bastion (F). ...