Another important point to keep in mind about the card system in Lost Ark is that each card has an "Awakening Level" to it Lost Ark Gold, indicated with the quantity of gems on the lower right inside the cards.A card starts at level 1 and goes up to 5 levels. It unlocks extra sets of bonuses and effects after it level's up.

To upgrade a card's level up to the following Awakening Level, you need to take two steps. The first is to boost its XP gauge , by feeding it XP cards or duplicate cards.You must continue to do this until the XP gauge fills up. When that happens you must feed it more duplicate cards in order to "Awaken" to it (push it over to the next level).

The more advanced the Awakening Level The more duplicate cards you'll need in order to get it to the next level. The duplicate cards required by every Awakening Level are listed below.Awakening Level 1: One duplicate cardsLevel 2 of Awakenings: Two duplicate cardsAwakening Level 3 Three duplicate cardsAwakening Level 4: Four duplicate cardsAwakening Level 5: Five duplicate cards

Be aware that there are so many duplicate cards in order to Awaken the card, it's a prudent idea to not feed a duplicated card only to increase its XP level Buy Lost Ark Gold.  Instead, it's much more efficient to just feed it XP cards.