So long as the revealed card has a mana value less than the spell you cast, you can cast it for free
By this, I mean that there is no requirement or cost to activate this effect
Sylveon ex has the following abilities: Happy Ribbon: Once during your turn, when you play this Pokmon from your hand to evolve 1 of your Pokmon, you may draw 2 cards What attacks does Sylveon ex have
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The archenemy still chooses which players they attack, and any of the heroes can block, but the entire team wins or loses together
Don't get me wrong, I see the appeal of being able to draw from your tokens in addition to your creatures, but that once a turn restriction is going to be a millstone around your neck more often than I think people give it credit for