I don't like the 2nd upgraded effect. Why should it be able to disarm your opponent? Isn't attacking twice per turn when cloaked enough of a skill? disarming your opponent seems like it should be part of its own separate card...
the whole while cloaked idea I really like and wish it wouldn't be so blatant stealing if I tried to make other cards using that effect
bypass shields while cloaked, cloak field for 1 turn when summoned, when this card is on the field increase the duration of cloak/decrease if the card is OP, some permanent that you can pay like 3-4 darkness quanta every turn to generate a turn of cloak... cloak decks ftw?