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While under the effect of Spell Storm (Enchantment, For X seconds Sorceries cost 25% less mana for each spell missing from your hand.) the spells on hand show as they're not available (partly greyed out) even though if you actually use that slot, they are casted as normal and only take the reduced amount of mana.
Could also be an issue with Alchemic Thaumaturge (Creature, Sorceries you cast cost 25% less mana), but I'm not sure about it.
Comments
agreed
This happens to me too. Pretty annoying, having to check the remaining mana to know if I can cast the sorceries or not.