Any Charizard card sells well, but a Shiny version is incredibly rare - this card alone can fetch roughly $200 USD
I have cast Timewalks off the remp he provides and won without my opponents getting a turn to react to the Tezz
Grades like GD+ work in an analogous way, however it usually only makes sense between Near Mint and Excellent, as nobody really cares if a card is LP+ or LP-
Bad Future: In the Timegate Traveller Pokstar movie, Bug Pokmon now control humans instead of viceversa
Only her color, single white, is a small flaw for me, as many angels, especially from newer editions, come up with multicolor and cannot be played in a deck that uses Giada as Commander
Finally, almost every store in existence has a buylist, or a list of cards the store is looking to buy and at what price