Hmm.
Interesting. Will AIs target it like normal permanents?
What do you mean when it becomes "a random active permanent from your Mark or other"? Does this include weapons and shields? If so, then that will be bad.
And can this even be coded?
Aside from these obvious flaws, this card is actually quite a good idea. Indirect permanent control, and more cards for Other. Toss this in a Rainbow deck for fun.
Good card.