All cards are backed by a certain amount of DEC. When burned, those DEC are awarded to the player.
The DEC burn value of a card can always be found on the Collection page in the rightmost column.
Card burn values are based on several factors:
Number of BCX
The DEC burn value is always displayed next to cards you own on the Collection page. If you do not own a certain card, you can also use the following community-made chart to determine the DEC burn value.