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! - El Shaddoll Construct (MP15-EN094) - Mega Pack 2015 - 1st Edition - Ultra Rare
Product description: Yu-Gi-Oh! is a strategic trading card game in which 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 : El Shaddoll Construct Card Type : EffectFusion Monster Card Number : MP15-EN094 Set : 2108 Mega Tin Pack Attribute : Light Level : 8 Monster Type : Fairy Passcode : 20366274 Card Text : 1 "Shaddoll" monster + 1 LIGHT monster Must first be Fusion Summoned. If this card is Special Summoned: You can send 1 "Shaddoll" card from your Deck to the Graveyard. At the start of the Damage Step, if this card battles a Special Summoned monster: Destroy that monster. If this card is sent to the Graveyard: You can target 1 "Shaddoll" Spell/Trap Card in your Graveyard; add it to your hand.
Product feature: A single individual card from the Yu-Gi-Oh! trading and collectible card game (TCG/CCG)., This is of Ultra Rare rarity., From the Mega Pack 2015 set., You will receive the 1st Edition version of this card.
Product price: $6.75
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