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River Song decks want as much topdeck manipulation as they can get

While its still pulling data from the TCG mid metric instead of TCG Market Price, its still one of the most common smartphone sources of looking up card prices in my experience

Magic: The Gathering Dominaria United Cards MTG: Dominaria United Collector Booster Box | 12 Packs + Box Topper Card (181 Cards) - $237.90 MTG: Dominaria United Bundle Includes 1 Set Booster Box + 1 Bundle - $165.12 MTG: Dominaria United Draft Booster Box | 36 Packs + Box Topper Card (541 Cards) - $120.13 MTG: Dominaria United Jumpstart Booster Box | 18 Packs (360 Cards) - $83.30 MTG: Dominaria United Collector Booster | 15 Cards - $20.94 Dominaria United releases September 9

The color matters theme wanted to reward multicolor, not punish it (although yes, there are a few exceptions)

Use this approach to give your evolved form a distinct and enhanced appearance