This protects it from hand disruption like discard effects, but can help it blend in with other foretold cards to make it impossible to see coming
According to the translation offered by Bulbapedia, the ability "mortal shuriken" allows Greninja's controller to discard a water energy from their hand, once per turn, to deal sixty damage to any of their opponent's Pokmon
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This means that Jolteon VMAX can attack with Max Thunder Rumble for a single Lightning Energy
Even though countless TCGs have been available over the years, very few have ever challenged the domination of the big three (Magic: The Gathering, Pokemon and Yu-Gi-Oh) in a serious way, but in 2023 Disney Lorcana truly shook up the scene and drew the attention of new legions of players and collectors
The suspend cost is beneficial, as when it comes back to your turn, you can choose to deal the damage directly to the opponent, or to a creature that your opponent may have played