We like to have each Class close to equal in power level in the Arena. Additionally, the lowest quality buckets have a reduced chance to be chosen. There are no bonuses for cards from the most recent set. Note that because spells and weapons are also Class cards, these two modifiers multiply, giving those cards a net 250% increase (2.0 * 1.75 = 3.5). We currently use the following modifiers to the weight of cards: A 100% increase for Class cards, a 50% decrease for neutral cards from the Classic and Basic sets, and a 75% increase for spells and weapons. A bucket with a total weight of 200 would have twice the chance of appearing as a bucket with a total weight of 100. The chance for each bucket to be picked is proportional to the total weight of all the cards in that bucket. For example, a card with a 50% increased chance of appearance would have a weight of 1.5. Many cards have an increased or decreased chance to appear depending on what type of card (spell, weapon, Class card, etc.) they are. While cards with very low pick rates are “demoted” a bucket, such as Fire Fly, which moved from bucket 2 to bucket 3 in 11.0. Cards with very high pick rates are “promoted” a bucket, such as Obsidian Statue, which moved from bucket 2 to bucket 1 in 11.0. We also know how likely players are to pick each card. There are a small number of cards in bucket 1, with the number of cards in each subsequent bucket increasing as the win chance declines. For example, when this system launched in 10.4, all the cards in bucket 1 were cards with a win chance over 53%. Cards are organized by their win chance, with similar values grouped into the same bucket. For each card, we know how likely a player is to win a game if that card is in their deck. You may wonder how cards get organized into buckets. For each pick, the game chooses a bucket by weighted-randomness (I’ll explain that a little later), and then pulls three cards from that bucket. The buckets are organized by performance quality, regardless of rarity. The buckets are currently comprised of seven categories of non-Legendary cards and three categories of Legendary cards. A card bucket is a grouping of cards according to specific criteria, including how often they’re chosen during a draft and how often they’re part of a winning deck. The picks are organized around the concept of card “buckets”.
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