Judge explains the investment theory: Supply is fixed (Pokmon isnt reprinting old cards), demand keeps growing (the nostalgic Millennial buyer pool isnt getting smaller), and conditions matter enormously (a professionally graded, pristine card can be worth 10 to 100 times more than the same card in rough shape)
That's a lot of value on its own, but there's more to it
One of those cards punishes opponents for overextending, and the other punishes them for inviting us to join their playgroup
Vigilance : Until end of turn, other Elves you control gain vigilance and get +1/+1 for each +1/+1 counter on Haldir
That being said, there is undeniably a strong theme to this deck, and if you are interested in a deck with strategy built in from the start rather than a deck with good bits and pieces, then this could be the deck for you