Since most of these cards are on the Reserved List, which are cards that Wizards of the Coast promised to never reprint, these old rare cards can make some very good investments.
Of particular interest is an 8 mana white enchantment (6WW) called Divine Intervention. What's particularly interesting about this card is its rather unique effect. There are several cards in Magic that serve as alternate win conditions. But Divine Intervention, after it has two intervention counters removed from it, actually ends the game in a draw.
From a competitive standpoint, this doesn't seem like a very fun card. It has seen some fringe play in Phelddagrif "group hug" EDH decks as a way to simply let no one win. It's not really a fun card, but it has its uses.
It doesn't seem like you'll be seeing Divine Intervention becoming a format staple anytime soon. But, seeing what a mediocre enchantment like Field of Dreams has done in price in the past, it can't hurt to find a good condition copy or two of this as an investment. All you need is for the supply to dry up all of a sudden which with these very old cards can happen quite easily.
If anything, this is just a cool gem from early Magic. It's a cool one to have. In EDH, it's a great way to end a Commander game no one really wants to play anymore.