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1 Changeling Hero

Unfortunately, "Celestial Sword" misses the timing when sent to the GY to use the effect of cards such as "Eatos" and "Ceal" as they both send the Equip Card as a cost, necessitating another card like "Release Restraint Wave" to activate its effect

Evolving Skies has hit $200 per booster box after ~1 year since its release in August 2021

but depending on which way you decide to brew the deck, Tome of the Guildpact may be an option for multi-color payoff, and should you be playing a lot of legendary creatures, Tome of Legends may also work

Ultimately, thanks to cards like Computer Search and Dowsing Machine, there is simply no argument for not running an ACE SPEC card in your deck