Planeswalker, Instant, Dragon..
Acquired Price Override: (Total Acquisition Costs / Number of Cards) = avg price
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at the beginning of your upkeep, you may put a soot counter on smokestack.
at the beginning of each player's upkeep, that player sacrifices a permanent for each soot counter on smokestack.
From the Vault: Annihilation
Secret Lair 30th Anniversary Countdown Kit