UFS as a system allows players to take cards from many different franchises (usually, but not always, drawn from the universes of video games and anime) and battle each other, with a refreshing level of compatibility that allows an incredible amount of customisation
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Furthermore, Fairy-type basic energy is one of two types of basic energy that has been rotated out of the card game along with the Dragon-type
If you do, any battle damage you take this turn is halved.
Trying to decide if you should cast the spell as-is or play it as a land to allow you to unleash something more impressive next turn makes for some really interesting strategic choices
Often, this case applied to the Phantom Knights archetype, as it has been very good throughout the game's history, but never good enough to be considered a top meta option