As Pokmon Legends Z-A takes place in Lumiose City within Kalos, it makes sense that Mega Pokemon would play a huge role in both the video and card games
It can be downright debilitating in a ninjutsu-themed deck, but it's still good to include in just any black draft deck
The only 1 per turn restriction seems unnecessary since "you cannot Summon other monsters the turn you activate this card (but you can Set)." already covers it
Everyone who collected back then saw their collections 3x, 7x, 10x, 20x over time and that money opened doors to more cards, rarer cards, or significant real life gains
Giant Adephage Giant Adephage is a seven-cost (five generic and two green) creature with Trample
So, a Fireball for two damage total (casting cost three) will deal four damage, but one for three damage to one target (casting cost four) will just deal three