You choose 1 of your opponent's level 3 or lower Digimon and place it under another of your opponent's Digimon as its bottom digivolution card or under an opponent's Tamer. For each Tamer you have in play with a different color, you add 1 to the maximum level you can choose with this effect. If you have a multicolor Tamer, you reference its colors that are different from your other Tamers and count it as 1 Tamer with a different color. For example, if you have a red Tamer, a red/blue Tamer, and a blue/yellow Tamer, you would refer to the red, blue, and yellow colors, then add +3 to the maximum level you can choose.

Yes, it will leave the battle area. The digivolution cards of the Digimon to be placed in digivolution cards will be trashed at the same time.