In Disney Lorcana, sapphire cards are strongly associated with the attributes of intelligence and resourcefulness, featuring characters or alternative versions of them who are known for using their brains to get out of trouble
Get over it
The preferences of the players determine the value of trading cards
Since Toxic Deluge gives the creatures -X/-X, it is a good way to get around indestructible, since creatures cannot have zero toughness, regardless of their indestructibility, and destroys those creatures regardless
Went in the next day and had the cards appraised while my first grader had fun looking at all the cool retro games and comics
It's strong in ETB heavy brews like midrange and blink, sacrifice brews where you can sacrifice to something like Attrition and then come back, Aristocrats where you can trigger Blood Artist for wins, life gain for lifelink shenanigans, Voltron and equipment that invested in equipment infrastructure to and any heavy creature build