In the world of Pokmon, every creature has unique abilities and powers that set it apart from the others
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Thats a massive advantage in decks that generate value each turn by untapping oppressive permanents like The One Ring, all while keeping up countermagic and other interaction
Keep in mind a creature returning from the grave is a new creature so alt +1+1 counter sources like Uncivil Unrest will draw again on resurrection
This should be enough information to help you figure out what sets your cards are from
Today it sees play mainly in Charizard ex decks, but may see inclusion in more decks in the future if we keep on seeing Rare Candy decks in the metagame