Incinerator of the Guilty is a mythic Creature — Dragon card from Murders at Karlov Manor (MKM), collector number 349. Current market price: $0.42 (foil $1.96), TCGplayer market prices via Scryfall.
Flying, trample Whenever this creature deals combat damage to a player, you may collect evidence X. When you do, this creature deals X damage to each creature and planeswalker that player controls. (To collect evidence X, exile cards with total mana value X or greater from your graveyard.)