Theres virtually no chance of a card thats out of print decreasing in value over time
Of course, as is usually the case for expensive cards that let you cast things from your hand for free, or put a permanent into play from your hand by the time you get to 7 mana you arent especially likely to have that many more cards in hand, and if you dont have one the turn you play the Unraveler, youre just playing an expensive flyer
That means that you can still run all of your favorite creatures with activated abilities while punishing your opponents for doing the same
That being said, the two cards are at a similar power level and are often found in the same deck
I only plan on buying things with Mewtwo's image on them, and I'm not paying $100 for a luggage tag
Mirkwood Bats Marcy: This list isn't meant to exactly point out synergies, but that's just to say that Mirkwood Bats finds a lot of comfortable homes in decks that generate tokens that are then easily used up, such as from Lotho, or any number of food token generators in the LoTR set