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If you want that cheap-but-high-stakes extra turn spell, you have better options

Its not really what you want to just jam for value, unless you have an above-average ability to see your opponents hand (perhaps Brain Maggot) and the format has gone a direction that is real heavy on certain cards (like Deathmist Raptor or Despoiler of Souls)

If another effect allows casting Flamerush Rider in an alternative way (for example, from exile, or at instant speed), you can use the alternative cost

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Theros had an enchantment theme (which could have been more prominent and powerful, but thats a different article) and it also had the Heroic keyword, which triggered when you cast a spell targeting a creature

Sacrifice creatures and life for cards, destruction, and life loss