Oh. I thought AP Carry was the one you had. Made a typo in your first post.
Anyway, I'd suggest AP Carry (which can also be used for supports as bio said) which would only mean changing ArPen reds for MagPen reds. So yeah get MagPen reds next imhhho.
Unless of course you hardly play any AP Carries or supports.
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No problem!
This is a cute and pop genocide of love!