Some cards, like character cards, show strength, which is how much damage they can deal during a challenge, willpower, which is how much damage it takes to banish that character, or a location and lore value, the latter of which is how much lore you gain when they quest
By exiling lands with this, you can do various fun stuff: Fetchlands turn all of your creatures into fetches
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If they have no Life cards left to draw at this point, the attacker wins the game