This more than makes up for the big weakness of Tombstone Stairwell: its cumulative upkeep cost
Other than the rarity of a card and its physical condition, a cards cool factor definitely plays a role in how much collectors are willing to pay
This black shiny form of Charizard is combined with also being a Tera-type ex card
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Next, at the end of your turn if a player controls no creatures (presumably because you've forced them to exile them all), you have to sacrifice this enchantment