Charizard cards and older cards that dont have a drop-shadow behind the image of the Pokemon have become especially lucrative, some going for thousands of dollars
Wizards of the Coast pioneered the First Edition Pokmon Cards concept for English and European releases when the Pokmon TCG debuted in the West, starting with the Base Set
Against slow and clunky midrange decks, ideally three or more colour ones you can expect the Sundering Titan to be pretty game endingly brutal
Once you control both cards, they 'meld', flipping over and combining to become a third card - the oversized Urza, Planeswalker
Where this may fit in would be in an Emergent Ultimatum deck
The exact appearance can vary by print era, but many real cards show a recognizable internal layer