What does “Choose any number of your opponent's Digimon whose play costs add up to 15 or less” mean, exactly?
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Official Ruling
You can choose any number of your opponent's Digimon, as long as the play costs of the chosen Digimon add up to 15 or less. For example, you could choose 1 Digimon with a play cost of 3 and 1 Digimon with a play cost of 12, or 1 Digimon with a play cost of 2 and 2 Digimon with play costs of 6.