The rules for Disney Lorcana leaked online yesterday, providing players their best look yet at the mechanics for pitting Micky, Elsa and other popular animated characters against each other
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)
There are a lot of good rares, like Opposition Agent, mythics, like Jeweled Lotus, and also some very useful uncommons, like Cultivate
If you're planning to build that deck, I think you should consider throwing Self-DestructSelf-Destruct in there
You gain a ton of life in the deck, and easily enough to discount the entire generic mana cost of any spell you want to cast
However, more high-power decks with increased reprint values found in sets like Modern Horizons 3 will set you back closer to $60