I used to criticize expansion in the Sword & Shield era for getting too big and featuring way too many secret rare cards, so it feels strange to complain that Pokemon 151 doesnt have enough chase cards
The set featured a Tera Charizard ex, who, thanks to the terastalization process, became a Darkness-type Pokemon and shifted around its weakness to Grass type
Phantasmal Flames focuses in on Mega Charizard X with a standard ex, Secret Art Rare, and Gold Hyper Rare
When this card is destroyed (either by battle or card effect) you can special summon 1 "Hades, Lord of the Underword" from your graveyard or deck
While it's a Fusion Monster by card type, its effect equips itself to a Monster as soon as you summon it, effectively making it an Equip Spell card that you need to fuse to use