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Counterspell, Arcane Denial, and Disallow are useful for any blue deck

Here, you can find it featured on all 10 rare dual lands, the rare Kellen, Inquisitive Prodigy card, and the mythic rare Kaya, Spirits' Justice planeswalker card

Having scry cards in your deck improves the effectiveness of your other cards more so than other mechanics

* Only the characteristics name, type, subtype, supertype, rules text, abilities, power, and toughness are affected by flipping a permanent

These decks are usually fairly straightforward to play, so Aragorn and Arwen, Wed is an excellent commander for beginners or newcomers to the format