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I've seen a few Worldfire decks on this site. Some better than others and I'm not sure how mine ranks. I've yet to test it with live play, but from initial building/testing, it seems fun enough but isn't always consistent. This deck uses R, W, B, G and the sideboard splashes Blue for control. The point is to get your mana ramped fast, O Ring a creature then Worldfire. There are many ways to do this but the main focus in this deck (aside from the Worldfire and O-Ring) are the Demonic Tutors and Demonic Revelations. If you get a Tutor first, use it to pull a Revelation from your library if you do not already have it. Keep ramping and with any luck you'll have enough mana to cast Diabolic Revelation before turn 5, preferably to get Worldfire, Oblivion Ring and/or the required mana and one creature if you still need it (by turn 6, you should have enough creatures that provide mana, lands already in play and maybe one or two of the Artifacts to cast Revelation for 3 or 4 cards worth). The rest is simple: Summon creature, O Ring it, next turn Worldfire, next turn swing for 1. At best, you can pull this combo off around turn 6 or 7. Small creatures will eat damage and 4 Fogs should buy you enough time to get your mana with cards like Manalith and Evolving Wilds.
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