Planeswalker, Instant, Dragon..
Acquired Price Override: (Total Acquisition Costs / Number of Cards) = avg price
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3r: destroy target artifact. hoard-smelter dragon gets +x/+0 until end of turn, where x is that artifact's converted mana cost.
Scars of Mirrodin
Commander Anthology Volume II
Forgotten Realms Commander
Starter Commander Decks