You may choose 1 card with a combination of having the [Hybrid] trait and a different name from your trash and place it under this Tamer. For each of your other Tamers, you add 2 to the maximum number of cards this effect may place under this Tamer. For example, if you have 1 Tamer other than this Tamer, you can choose up to 3 cards with the [Hybrid] trait and different names from your trash and place them under this Tamer.

No, it can't attack. A new attack declaration can't be made during an attack. In such cases, even if you activate this card's [End of Your Turn] inherited effect when you already have an attacking digimon, a new attack can't be performed using a Digimon with this card in its digivolution cards.