The strategy with a card like this is extremely straight forward, you'll hope to get this card in your hand to start the game, then you can use Headbutt right away and then Low Kick after that, of course you'll want to move this card into the active Pokemon spot as soon as possible
Heres an early ranking of all Duskmourn special guest cards within the Limited format
I like taking mana fixing very highly in Vintage Cube in general, especially the fetchlands, because thanks to all the dual lands and Triomes, it is very easy to find lands that produce multiple colors of the mana your deck needs
Its even great with more niche cards like Crop Rotation and Sylvan Safekeeper
however it is worth noting Platinum Angel did show up in Standard back in the day
Smeargles painting skills are always improving, clear from the self-portrait its composed with an unsuspecting Bibarel gnawing on a tree in the background of this card