Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Magic: The Gathering Modern Legal Sliver Custom Magic Deck
Product description: This is the sliver deck to get. If you've not tried Slivers on for size, you're missing out on one of the best (and original) tribes in magic. Slivers empower each other exceptionally quickly and overwhelm your opponent. This deck is a blast to play and is a very competitive deck. About the Seller: I make custom Magic the Gathering (MTG) Decks for sale. Why buy from me? I've been playing Magic: The Gathering on-and-off for nearly 20 years and have loved the game for as long as I've known it. Crafting decks and improving them is my favorite part of the experience and I am honored to share that with you. Strategy, execution, flavor, interaction, and fun are all important elements of deck crafting, and, to me, Magic is a game that's to be enjoyed with friends and family. I do not make, use, or sell "infinite combo" decks which remove player interaction or decks which result in one/two turn wins. Nobody wants to play against that, so I don't make it. I always have a number of decks for sale in various price ranges, colors, and play styles. Additionally, I am happy to speak with you if you have a particular idea for a deck as I relish opportunities to create unique works for my customers (these are my favorite decks to make).
Product feature: Magic: The Gathering, Magic: The Gathering Deck, MTG, Magic Deck, MTG Deck
Product brand: Dan of the Many
Target attributes: Game
Answer: attribute: game
value: mtg
source: product feature
attribute: game
value: magic the gathering
source: product description
attribute: game
value: magic: the gathering
source: product description
attribute: game
value: magic: the gathering
source: product title
attribute: game
value: magic: the gathering
source: product feature