Mew VMAX can copy the attacks of your Fusion Strike Pokemon in play, which will be a perfect opportunity to surprise your opponent with an unexpected attack
I wouldn't play this as your only monarch card since you really need to maintain the monarchy for its full potential, but it's just another layer of value in a dedicated deck
unlike literally everyone else in the game, who may ignore damage and horror for as long as they avoid being reduced to zero health or sanity, Mark gets penalised for accumulating too much damage, taking penalties to every stat until he treats his wounds (due to "Its All My Fault" weakness, that overwrites one of his signatures), and potentially taking severe hit to his sanity if he draws his "Shell-Shocked" weakness Critical Status Buff: Inverted, if Mark takes five or more damage, his permanent weakness triggers, disabling Sophie's photo and lowering all of Mark's skills by one
Vaevictus works best for you when you can manipulate the top of your library via scry effects or by returning cards to the top of your library, like with Reclaim
Pegasus ended up having his left eye taken out, and Shadi then forced the Millennium Eye into the empty socket
It was clearly a plant in Wilds of Eldraine to get decks ready for rabbits with Bloomburrow