I like the idea of creating mid runewords and new equipment to help reducing the gap between phases of the game and even styles of play, but i have to disagree with the philosophy around the runewords Mosaic and Metamorphosis.
You see, martial arts and shapeshifters need help, really, but creating itens that change mechanics of the class is not the way to do it.
When you create special mechanics in specific itens, you kill itemization, making the item mandatory (if such change in fact helps the skill).
That being said, the changes should be made directly to the class skill, for example, put the marks on the Lycanthropy passive, makign it exclusive to the class, or at the respective werewolf/werebear skill, making it possible to use with other classes when using stuff like beast runeword, if thats intended, but dont make an item that is needed to make a class feature work.
In the case of assassin i can even give another example. Imagine that, after creating these claws, she still need another help for MA, and they create a helmet wich alway get 3 charges on hit. The MA assassin will now lose claws + helmet itemization, because you need those features to make it playable.
So please, skill changes should happen directly on character, making all finishers having the chance to not spend charges, being it fixed or growing chance, but stop creating itens that nullify itemization, let those kinds of equipment stay on D3.
As i am here, i would like to also give an idea for hustle armor: Give it 2 teleport charges with replenish charges 3-5 seconds, effectively giving an strategic teleport without having the OP power of enigma.