Spend (this mana only) to cast a creature spell of the chosen type
vs
Spend this mana (only to cast a creature spell of the chosen type)
I can see where the parsing might have been misunderstandable.
Anyway, just show him this thread. Or ask a judge. Or show him some youtube videos on MTGO/pro level play of how it’s used.
Op’s friend: Your interpretation is wrong, sorry!
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