Mistform Sliver

I'm going to compare this card to the changelings of Lorwyn block. There were a bunch of "mistform" creatures in the Onslaught block that became a creature type instead of already being them.

Changelings are what the mistform creatures wanted to be because they added creature type accessibility to all colors instead of just blue. In addition, since the mistform creatures could only be one type at a time and was a discretion of the controller, there was a lot less interactivity.

Mistform Silver is unique among the mistform creatures because it is the only one that retains its original creatures types while gaining a new one. Obviously, this is so that it doesn't stop giving itself its ability. (If you made it a cleric and it didn't have that addendum, it would be a Creature - Cleric instead of a Creature - Cleric Illusion Sliver.) I understand the change, but part of me also feels like it functions so differently from the rest of the mistforms that it could result in a lot of confusion.