Ive been playing MTG off and on since more or less when it first came out
Prices find a new plateau, and tend to stay there for 3-6 weeks as people get the new card in hand, build decks, and go to town, and as the hype cycle moves on to the next new thing, the card price trends down again very slowly
Besides having the first edition stamp, which is always a plus, this card also has the white part of the body touching the gold of the card art
No Mercy is one of the most powerful game changing effects ever printed in multiplayer, and even this limited version is amazing
When a card rotates out of the format or gets power-crept by a new release, the price usually drops back down
Cards with Adventures are very strong since they have two different usages depending on the game state