You won't find that one in a LTR Collector Booster, but there's still other serialized treasures to find: The Elven, Dwarven, and Human rings of power each appeared as serialized foil Sol Ring cards (300 Elven, 700 Dwarven, 900 Human) and, as it's usually the case, extended-art and alternate scene cards are exclusive to LTR Collector Boosters
You seem to be spending some decent money on your collection goals and no one knows everything when they start, so ebay should be able to cancel your bid (call if necessary) and take it all as a learning experience
Buster Sword Buster Sword earns its spot by being incredibly solid, even if its far from busted
At the beginning of combat on your turn, create a 1/1 red Goblin creature token with haste
And yes, by the way, those squirrels in the lower right corner are from Squirrel Wrangler (Carl Critchlow illustrated both pieces)
Triggered abilities (starting with "when," "whenever," or "at") are unaffected by Karn
