They are not compatible with any other types of Pokemon cards, such as V or GX Pokemon cards
Condition plays a big role here, given the potential value of a Xerneas EX in NM condition, with such copies commanding up to $30, while LP copies drop below $20, indicating that there's a strong demand to buy and grade this card, which could potentially enhance the value depending on the company and grade
Make sure you have a Wizards account or know your details (email/password)
The Pokmon brand obviously plays a huge role, but its not just nostalgia driving this success
If damage from a noncreature source is prevented this way, Comeuppance deals that much damage to the source's controller
You cant improvise for colored mana, no matter the properties of the artifact you tap