Card advantage

Card Advantage is a way of referring to how profitable cards are when they are played, in terms of how many cards you have before, and after they are played.

For exmaple, Pot of Greed is a +1 in terms of Card Advantage, because you use one card, and gain not only one to replenish the one you used, but a new one in addition to that. Pot of Avarice, while moving 5 monsters from your Graveyard to your Deck, follows the same +1.

Graceful Charity, is a 1 for 1 Card, because you use it (-1), Draw 3 (+2), then discard 2 (0), so the end result is, you trade Graceful Charity for one card.

Fusion and Ritual Monsters are nearly always bad in terms of Card Advantage (usually -2 for Fusion Monsters and Ritual Monsters, sometimes even -3).