I use it in my decks, these 2 cards go in almost by default these days
While it doesnt explicitly feature a Trainer, this card showcases Mew in its VMAX form against a void-like, all-black background accented with gold and pink outlines
Doctor Doom, King Of Latveria One of three precon Commander inclusions on this list, Doctor Doom, King of Latveria is a great Connive Commander, but he's been dealt a short straw with the quality of the Doom Prevails precon
1 Special Summoned "The Winged Dragon of Ra" you control gains ATK/DEF equal to the amount of LP paid (even if this card leaves the field)
The result is that Vintage decks can reach up to $90,000 to buy and play in a sanctioned event where proxies are banned or the cost of printer ink to proxy anywhere else
There is also the Background mechanic, which seems like a way of fixing Partner as Backgrounds don't do anything unless a commander is on the field