Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Yu-Gi-Oh! - Black Luster Soldier - Envoy of the Beginning (GLD4-EN013) - Gold Series 4: Pyramids Edition - Limited Edition - Gold Rare
Product description: Yu-Gi-Oh! is a strategic trading card game in two players Duel each other using a variety of Monster, Spell, and Trap Cards to defeat their opponent's monsters and be the first to drop the other's Life Points to 0. Card Name : Black Luster Soldier - Envoy of the Beginning Card Type : Effect Monster Card Number : GLD4-EN013 Set : Gold Series 4: Pyramids Edition Attack/Defense : 3000/2500 Attribute : Light Level : 8 Monster Type : Warrior Passcode : 72989439 Card Text : This card cannot be Normal Summoned or Set. This card can only be Special Summoned by removing 1 LIGHT and 1 DARK monster in your Graveyard from play. Once during each of your turns, you can select and activate 1 of the following effects: *Remove 1 monster on the field from play. If you activate this effect, this card cannot attack during this turn. If this card destroyed your opponent's monster as a result of battle, it can attack once again in a row.
Product feature: A single individual card from the Yu-Gi-Oh! trading and collectible card game (TCG/CCG)., This is of Gold Rare rarity., From the Gold Series 4: Pyramids Edition set., You will receive the Limited Edition version of this card.
Product price: $16.73
Product brand: Yu-Gi-Oh!
Target attributes: Game
Answer: attribute: game
value: yu-gi-oh!
source: product brand
attribute: game
value: yu-gi-oh!
source: product feature
attribute: game
value: yu-gi-oh!
source: product title
attribute: game
value: yu-gi-oh!
source: product description