The 25th Anniversary Tin is a celebration of Yu-Gi-Oh after twenty-five years of success
If you have cards you no longer want, why not sell them
Since it is both Fire and Lightning type, it can also attack for multiple Weaknesses
Alternatively, they could keep their Earth attribute while getting an erratum that specifies they are also Metal or Wood, so as not to change their effects if they involve Earth attribute monsters in some way
Your opponent is forced to reveal their hand
R Rare Kahyoreigetsu X SPELL Equip Special Summon 1 Level 4 or lower Fairy, Spellcaster, Winged Beast, or Beast-Warrior monster from your hand, and if you do, equip it with this card, then you can return all Dragon monsters on the field to the hand