Like most Magic: The Gathering cards, the value of The Tenth Doctor depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Doctor Who)
The style is brazenly unique but also deliberately functional
Most imprint cards are artifacts or interact with artifacts, so there's room for those in an artifact-matters Commander deck
Zoroark ex's Brutal Bash only costs 1 Darkness Energy, which makes it ready to attack as soon as it is on field
Watching and waiting, Ooh, its sittin' with you, but its eyes are on the door
With R&D always in need of new design space to keep things fresh, theres no reason to keep sitting on an idea as useful as watermarks, or cool as a token-based Planeswalker