This card has an effect that reads, "For each of your Digimon with [D-Brigade] in its type, add +1 to the maximum play cost of the Digimon you can choose with this effect." What does this mean?
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Official Ruling
If you have a Digimon with [D-Brigade] in its type, you can choose a Digimon with a play cost of 4 or less. (3 or less + 1 = 4 or less.) If you have 2 Digimon with [D-Brigade], you can choose a play cost of 5 or less, if you have 3 Digimon it becomes 6 or less, and so on.
Source: BT4-110 Dark Roar