Each Grandmaster Rare card has an individual serial number engraved on it, and no two cards have the same serial number
Knuckles the Echidna Knuckles is an interesting design for Magic: The Gathering as hes got a head of steam as a voltron type commander with a flurry of keywords, and comes with his own back up alternate win condition
As for upgrades, doing something like this is a good idea: 1 Tanemon BT1-007 3 Goblimon BT1-064 3 Mimi Tachikawa BT1-089 1 Argomon BT2-047 4 Minomon BT3-004 2 Terriermon BT3-046 3 Gargomon BT3-048 4 Stingmon BT3-050 1 Blossomon BT3-054 2 MegaGargomon BT3-057 2 BanchoStingmon BT3-058 1 Hidden Potential Discovered
Its interesting to see this card in less than 800 decks on EDHRec while Brave the Sands shows up in over 30,000
As a result of this, some, or rather one, of the picks may look rather unorthodox
On average by pulling 76 packs you are likely to gain enough value in SRs and URs to make it worth but it is still a gamble nonetheless, especially considering the cards you are crafting are generally not too useful