The card is popular, nostalgic, and iconic, and makes a fantastic choice for 1994's promo, even if the card doesn't see any significant play
Booster boxes are especially good value when: You have a full pod You want prize packs Everyone is splitting the cost Your group enjoys opening sealed product You want a social event rather than just individual pack opening Buying singles is better when you need specific cards for Commander, Standard, Modern, or another constructed deck
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The additional text here is that it costs one mana less to cast for each creature card in your graveyard, and it can be as cheap as one Black mana
In that case, it remains a colorless 6/4 Construct artifact creature with haste, and its mana value is 7
Collectors are especially fond of Alternate Art cards, so those tend to also be very valuable