If you want to use it, please use it as a set with Spiral Spear Strike
(Prism Star) Rule: You can't have more than 1 card with the same name in your deck

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Heck, any white- or red-based deck would be happy to have them
Similarly, if a spell is cast without paying its mana cost, but the player did pay mana for additional costs such as from kicker or from Thorn of Amethyst, Boromir's second ability won't trigger and won't counter that spell