yugioh crystal card Game Crave Tournament Store - Bond (SDCB-EN046) up card is destroyed in a Monster Zone Harmony Crystal Card Profile :

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And since new Koths so similar to L of the DR (except rare, notably, not mythic rare), we can look to that one to see how we should play Koth

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For just three mana you can tap Brash Taunter to force it to fight another creature, except when Brash Taunter is dealt damage, you also deal that much damage to an opponent

Im from Taiwan

If an effect allows you to spend mana "as though it were mana" of any color or type, that allows you to spend mana you couldn't otherwise spend, but it doesn't change what mana you spent to cast the spell