Crafting consumes Arcane Dust to produce new cards, while disenchanting allows players to destroy unwanted cards, granting a quantity of Arcane Dust in exchange. Crafting is the quickest and most direct way of obtaining a specific card, provided you have sufficient Dust.
The amount of Arcane Dust required for crafting, and granted by disenchanting, is determined by the card's rarity. Golden cards also cost several times more Dust to craft, and reward several times more for disenchanting.
Only cards from the expert card set can be crafted or disenchanted. Reward cards and basic cards, as well as golden basic cards gained from levelling heroes, are considered soulbound and cannot be crafted or disenchanted.
The combination of disenchanting and crafting allows players to convert unwanted cards into more desirable options. However, crafting any card costs between four and eight times more Dust than would be rewarded for disenchanting the same card. This makes the process extremely inefficient. Nonetheless this can be an effective way of obtaining rare cards, and may be a desirable option when disenchanting unwanted cards.
Since players can only have 2 of any card in a deck (and only 1 of each legendary card), disenchanting duplicate cards above this limit may be considered to have no true cost to the player. The 'mass disenchant' option allows players to automatically disenchant all duplicate cards in their collection.
The only limitation to crafting lies in the required amount of Arcane Dust. While it is not possible to purchase Dust directly, all cards obtained through card packs can be disenchanted. Dust can also be obtained as a reward in the Arena. The player's current supply of Arcane Dust can be viewed in the My Collection screen.
 Crafting cost