Ran out of room in the description... Fireblast is instant, 4 damage to a creature or player, and can be cast by sacrificing 2 untapped mountains. The result is that your opponant's life total becomes effectively (4*Fireblasts) less when they're tapped out. Since you don't need mana to use the fireblasts, you can fully tap every turn and still be both intimidating and capable. Soon as they hit 4/8/12 life and tap all their mana, you can kill them with very little worry.
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