This was confirmed in a blog post on the official Pokmon site, where it was also revealed that "reprints of popular cards from recent expansions that feature all-new artwork" will be included as well
Expropriate: Cast it with Show and Tell, otherwise, a late game play, and an epic one, most likely
Speaking of prowess, the creature side of Elusive Otter has that keyword ability, and it also cant be blocked by creatures with power less than its power, making for an elegant and highly synergistic card, especially when paired with more Otters
Tapu Koko VMAX Combined with Electrode from Vivid Voltageand perhaps even Omastar from Team UpTapu Koko VMAX looks to be a potential menace, keeping the opponent either locked up with Paralysis or knocking them out entirely with its Max Shock attack
Older versions of cards can be used if a legal reprint exists with a current regulation mark
The second knock is that Alena relies on either a steady flow of creature token generation, or a big turn with a flurry of cards for which some of your best cards are Ball Lightning, Bonecrusher Giant has more power than mana cost, and Cosmic Larva has a real drawback