Its like the transform cards from March of the Machine , in that they enter the battlefield with the front face up, and you have to pay a cost to transform it into its more powerful back face
The rest of the monsters exist as essential cards in the Counter Fairy strategy
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Also, Release can be done in a free chain during the main phase, so it can also be used to evade when the opponent is about to banish a card that would be a problem if banished, such as a Slayer
Its appearance in Pokmon Omega Ruby and Alpha Sapphire only cemented its legendary status, introducing the powerful Mega Evolution mechanic, which further expanded its already impressive lore and capabilities