[On Play] By placing this Digimon under 1 of your Digimon with [Legend-Arms] or [Xros Heart] in its traits as its bottom digivolution card, <De-Digivolve 1> on 1 of your opponent's Digimon (Trash up to 1 card from the top of one of your opponent's Digimon. If it has no digivolution cards, or becomes a level 3 Digimon, you can't trash any more cards).