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Every fully splashable new card from the new set. This only includes cards that are either fully colorless or can provide their own colored energy all on their own, without any outside sources. Also does not include cards that are partially splashable, as in needing just one natural energy and the rest colorless.
(Obviously, you'd be really stupid to try and splash Magmortar or Electvire this way, but it is technically possible. Same with Magnezone but its slightly more realistic)