This doesn't seem wholly sufficient to explain the spike, otherwise why didn't it pop off during Bloomburrow, which brought in a popular new bird commander Kastral, the Windcrested
A card is only worth what someone is willing to pay for it
Mangara is a sweet design, and it works well in a lot of decks
Yes, you can play Blind Obedience in mono-white Commander decks

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Standard Arena packs and mythic packs both have eight cards, but they branch from each other very lightly in that the normal packs have a single slot for a rare or mythic rare card while the mythic pack virtually guarantees that you find a mythic rare in that slot