Whilst you do need to meet the requirement of having three legendary creatures on your side of the battlefield, this requirement is actually a bit easier to meet than it sounds because Kolvori herself counts towards that, meaning you only need two additional legendary creatures by her side

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Commanded by Atarka, World Render, this deck ramps up mana fast and then drops game-ending beasts that hit hard and hit often
As for the Pokemon TCG Pocket trade feature, the announcement confirmed only Genetic Apex and Mythical Island expansion cards will be available to swap