At this stage, I also like to do a preliminary digital color blocking, to make sure I have the color and value tangents worked out, and also to show my art director at WotC so they are on the same page as I am (no one likes surprises in the later stages of a commissioned art piece)
Locking out artifact mana, Chromatic Spheres, Expedition Maps, Engineered Explosives, Aether Vial, equipment, Oblivion Stone, and more, Collector Ouphe really is just a 2/2 Stony Silence
I love the ability to make one of your dorks an artifact creature the turn before you wipe the board of non-artifacts, thus saving at least one of your own creatures
In theory, the playability of both of these cards could make the new Source Material variants more expensive than normal
Brotherhoods End: I love a good modal spell
These cards are Poker-sized and printed on a firm cardstock with an excellent feel