"Discard" should be capitalized there. This as a 1-drop common seems like it would potentially be quite oppressive. 3 damage will take basically all early aggressive drops so I'm rather unsure how will any aggressive deck push through this with creatures. That's fine-ish for cards of higher rarities since you can spend your removal on some of them, though spending your scarce limited removal on a 1-drop is rough, but when that is compounded by the card being common, this just seems too much. We are talking about a strong, repeated removal engine here.

Some potentially comparable cards: Arbalest Elite (sucks of just how reserved the card developmentally is prolly exactly because of concerns I highlighted, also uncommon), Stern Constable, Netter en-Dal? I don't think the two other spellshifters are even close to being just straight up delete any Hill Giants trying to get involved in combat.

Btw, while it's a pretty obscure creature type with no mechanical relevance, I think "Spellshaper" would fit this card really well and be a neat little callback

Thank you for your comments! :-)