EX12-059 Machinedramon ACE

No, you can't. A "by" condition can't be met if only some of the required actions are performed. The conditions for this [On Play] [When Digivolving] [When Attacking] effect require you to place the specified number of cards as the bottom digivolution cards.

This means that the effect prevents processing of "(perform XX on) stacked cards."For example, a "can't trash stacked cards" effect prevents trashing the top stacked cards by <De-Digivolve> (which trashes the top stacked cards) or similar effects, and it prevents trashing the bottom stacked cards by "trash a digivolution card" or similar effects.However, because the effect only prevents processing "(perform XX on) stacked cards," XX is still permitted to be performed on the Digimon itself, for instance by effects that tell you to "perform XX" on the Digimon.