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(4/29/2022) The mana value of a double-faced card in your graveyard is always the mana value of the front face

Counter target spell

They require you to go five turns without taking damage (or proliferate their filibuster counters), but there are many ways in blue and white that can keep you clear from danger, like Magus of the Moat, fogs, and Ghostly Prison effects

Mirror Entity can turn a board of any 4 creatures into a full party by itself, and acts as a manasink to buff a board of small creatures into a lethal force

The amount of Mana you need can be more complex, depending on how you split your Colors, but the game has cards that give Mana for more than one color

Each pack also includes a Legendary card alongside its Echoverse alternate, giving you more than 60 Legendary cards across a full box