If youre willing to wait until your fifth turn to have found the needed legendary creatures and are happy with a 75% chance of having Kolvori be a 6/6, then you only need a mere thirteen non-Kolvori legendary creatures, which is a much easier number to come to and still sounds acceptable to me
She can summon up two random basic Pokmon with 50 HP or less

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I personally cant recall ever seeing a 20- or 21-land draft deck
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