「Evolution Protocol」Ultron

ACTI【HAND】:You attach this card from HAND to 1 of your characters with Lv4 or above and 【Machine】 in their features in the field.

ACTI【BACK/ONCE PER TURN】:You show 1 of your set cards in BASE. If you do and that set card is with Lv1 and 【Machine】 in its feature, you move that set card back to your HAND.