There are a number of reasons for this: Its very manageable to upgrade them and keep the decklists updated I can play them frequently and see new cards more frequently I can keep fresh on play patterns and sequencing so I can play faster I can ensure they are all doing something different The last one is super important to me keeping my decks as fresh as possible, and not overly relying on the same cards or play patterns
The second deck in the set is Spirit Squadron, a white-blue deck commanded by Millicent, Restless Revenant
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Red gets you good damage doublers, white gets you lots of lifelink, and blue gets you a bunch of interaction
Use this to build a curve: 1-3 for the low end, 4-5 for mid-range threats, 6+ for bombs and finishers
What makes it work