If we think about creature auras using quadrant theory, enchanting your own creatures is something thats great when youre in a winning board state, reasonable when youre at parity, risky during the developing turns of the game and actively bad when youre behind
Because you just need treasures from any source to buff creatures, this gives you a ton of options with combo potential, especially with Mari and cards like Deadly Dispute or Academy Manufactor to increase the value of all of your various effects that rely on treasures
Because of their limited supply, their rarity shot up over time, and naturally, so did the demand among collectors
Coming To Amercia/Europe
In the early days of Yu-Gi-Oh!, Trap Cards were among the strongest cards in the game, and even today they play a pivotal role in many decks
Neyali, Suns Vanguard Token decks need effects that boost the power of their 1/1s so they can win the game, and double strike is a perfect because it stacks very well with anthems