Format Legalities
Format:
Block Constructed
Standard (T2)
Extended
Modern
Legacy
Vintage
Commander (EDH)
Legal:
Official Oracle Text
Bonfire of the Damned deals X damage to target player and each creature he or she controls.
Miracle
(You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)
Miracle
(You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.) 
Official Rulings
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Author: neccrow
Comment:whats up with the duel x mana cost?
Author: Cfranks
Comment:you have to pay the same amount for each x. they have existed for a long time but are not used to frequently
Author: Zabo
Comment:do you have to pay one mana for each "X" and then tap as many mana as you want or just tap one red and however many you want?
Author: Meng
Comment:You pay 2 and get 1. So if you want to deal 10 damage, you pay 20 mana.
Author: Meng
Comment:You pay 2 and get 1. So if you want to deal 10 damage, you pay 20 mana.