A card whose main use in a deck is to fill out “the curve”.
Filler cards in Gwent are usually low-provision cost cards that, while playable, do not contribute any kind of synergy or other major advantage to the deck in which they are placed. They are often mulliganed away when they are drawn, or played early or after a pass so they do not clog up the deck.
In CCGs with a mana system, the equivalent cards are usually low-mana cost cards that ensure you are stuck with nothing to do on a given turn.
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