old gastly pokemon card evolves-from:gastly ‹ PkmnCards [Fighting] x2 Retreat Cost Carta Pokemon Gastly 006/027 Japonês

The answer is not very, at least as far as tournament formats are concerned

With three ability keywords, Aurelia has some evasion and the ability to attack the turn she comes out, and then hang back and play defense

Appendix and Reference Type 4/Limited Infinity Introduction Type 4: A Way to Enjoy Magic Again Part 1 Type 4: A Way to Enjoy Magic Again Part 2 Type 4: A Way to Enjoy Magic Again Part 3 The Fourth Type * Chaos Stack a Chaos Stack is a separate stack of cards in addition to the normal Type 4 stack, and is used in conjunction with the Chaos Rule, which is essentially if X or more spells have been cast in a single turn (where X is an amount agreed to by the players beforehand), all spells on the stack are paused and the top card from the Chaos Stack is immediately flipped up and resolved, and then the stack and rest of the game is unpaused and continues as normal

In fact, I doubt youd be able to sell any of them online