Even though Nightchaser is a target, it seems like you'll mostly be using Retroactive as a substitute, so there won't be many opportunities to use this for that purpose
If something moves the Melded card (to the Graveyard or Exile or whatever), it moves both physical cards
The gold-bordered, fully gilded cards numbered past the set size
The point is, these attacks don't mess around
Blaine's Charizard is the undisputed king of both Gym Heroes and Gym Challenge, the single most expensive card across both expansions by a significant margin, and one of the most iconic Charizard variants in the entire history of the hobby
The ATK of the selected monster becomes 0, and it cannot change its battle position