That is a huge buff for your side of the battlefield that your opponent will have a difficult time fending off
And Im not apologizing for the fact that these two aspects of flavor, when twinned together, just move in a way Magic doesnt normally do
Jin-Gitaxias, Core Augur is a prime example
(An exerted creature wont untap during your next untap step.) The only way to finish the Trial of Strength is with a basilisk scale in hand
Its not completely out of the question, but it takes a lot for this type of trick to be good, and this one is barely a mana undercosted for having to really set it up
While sealed products are preferential for long-term investors, its not uncommon for them to purchase many copies of limited cards, like the Van Gogh Pikachu, again driving prices up for genuine collectors