Like most Pokmon cards, the value of Mega Absol ex depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Mega Evolution)
Altars can still have some uses like decking our opponents with the help of Hedron Crab or just make it so we have more creatures to bring back, but I dont think it is reliable enough to keep the whole Altar+Bridge engine
The two might be practicing a new move together or unlocked a new level, making the determined duo the most valuable card in the set
Shoot in even, indirect light and avoid glare on holo cards for the most accurate match
The wear and tear on the print film used for the set resulted in the colors on the cards coming out faded
Great for trading, collecting, and gameplay