Around the release of OP02, cards were still terribly difficult to come by, so this particular Manga Rare kept its value for quite some time
Beast Within also has the flexibility of hitting any permanent, and while I definitely understand not wanting to give green an instant speed board wipe for all permanents, I feel like this card would have seen more play if it also hit nonbasic lands
The deck is Azorius (white/blue) with a unique playstyle that lands between Voltron (focusing on a specific creature and keeping it protected with high stats) and spellslinger (casting as many spells as possible)
While Kai Budde Decklist could be a fun and flavorful addition to a deck, it may not be the most competitive choice for serious play
"Commander tax," the additional cost of two mana for every time you've cast a commander from the command zone, applies separately to your Background
Eladamri is a solid pickup for Elves decks, like most pushed Elves these days