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Youll want as many cost reducing effects as you can get, so I suggest stocking up on Sapphire Medallion, Herald's Horn, and Urza's Incubator if you plan to go the sphinx tribal route

Keeping a counter spell up for your opponent's commander means you've not only disrupted their plans, but you can either cast something else for free or add a card to your hand

Get 1 Rare or Mythic Rare, 3 Uncommons, 10 Commons, and 1 Snow Land (basic or tapped dual) in every pack

Graded Population Report: Cecil Harvey #18 Visualize the distrbution of grades in the chart

That's yours for stuff like heroic or your foe's for interaction