[When Digivolving] If you don't have a [Trial of the Four Great Dragons] in play, you may place 1 [Trial of the Four Great Dragons] from your hand in your battle area. [Your Turn] (Once Per Turn) When you play a Digimon with [Four Great Dragons] in its traits or place [Trial of the Four Great Dragons] in your battle area, 1 of your opponent's Digimon gets -3000 DP for the turn.