If G'raha Tia and one or more other creatures and/or artifacts you control die at the same time, its last ability will trigger once (as long as it hasn't already triggered this turn)
The first four sets will rotate out of the Core Constructed format, but will still be available to play in a new format, called Infinity Constructed
My only hope with Disney Lorcana is that it gains mainstream appeal
So thats the core of the deck, and we can complement it alongside a more traditional Amethyst/Steel package
The second ability is a bit less frequently used, but its a great protection skill that allows you to evade a removal spell that intends to destroy one of your creatures with any sort of damage, be it targeted or a universal board wipe in MTG like Blasphemous Act
Those two cards are fairly expensive as they are already very good cards in their own right