[On Play] [When Attacking] [De-Digivolve 4] 1 of your opponent's Digimon. [When Digivolving] None of your opponent's level 4 or lower Digimon can digivolve until the end of their turn. [All Turns] [Once Per Turn] When this Digimon would leave battle area other than by one of your effects, you may play 1 Digimon card with the [Rock Dragon]/[Earth Dragon] trait from your trash without paying the cost.