I just think the card is well executed it being an artifact plays well with Urzas Saga, Improvise and Springleaf Drum, and unlike Thalia, Guardian of Thraben where youre locked out by the tax, you have the choice with Esper Sentinel which presents interesting in-game decisions as you have to balance the tax on the mana versus providing your opponent with card advantage a similar decision to that of being on the play or on the draw
Generally, Final Fantasy summons will only hang around for a short period of time
Mew EX, Lugia EX, and a collection of other eye-catching full-art Pokemon put the cherry on top of Legendary Treasures
Plus, it still does the job of freeing up land for any instants you may need to counter spells
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The most famous use of this was Land Tax: Stay a land behind, and you don't just have unlimited lands