Ward.
On Evolve - Select an enemy follower that costs 2 or less on the field and return it to its owner's hand.
Lesson (1): Select another card that costs 1 or less on your field and return it to its owner's hand. For the rest of this turn, this card's abilities can't be activated.
QIs the cost of an evolved follower the same as its unevolved form?
AYes, it is.
QIf I have multiple copies of this follower on my field, can I activate each copy's ability in the same turn?
AYes, you can.
QIf I activate this follower's ability, then evolve it, can I activate its ability again this turn?
ANo, you can't. This follower's activated ability states that you cannot activate any other abilities of this follower apart from evolving it for the rest of this turn. The evolved form of a follower is still considered the same follower. Therefore, you cannot activate its ability again this turn.