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Endure is a keyword that is followed by a number

apply the following effect based on where you sent it from

Banish all monsters from either Graveyard, then inflict 100 damage to your opponent's Life Points for each card banished by this effect, but your opponent takes no damage for the rest of this turn.

If the requirement was 1 Energy less, Swanna would be much more usable, but 3 Energy cards seem like a ludicrous requirement for an attack that doesn't even have a special effect

In retro formats, the card even sees play outside of dedicated Hero decks, as it can also destroy spell and trap cards on the opponent's field