Celerity indicates in the description that it can be casted repeatedly to increase the initiative of a unit. In practice it works like an enchantment that you can cast only once on a unit.

Focus indicates in the description that your next spell will deal double damage; as it turns out this does not work when the spell you cast has a casting time. Specifically I tried to cast a "focused fireball". You lose "focus" on the first round of casting fireball.

Suggestion: I think there is room for several "meta" spells like "Focus" (meaning they act similar to meta-magic feats in DnD). I could imagine a "Widen" spell that increases the area of effect of a spell by 1 radius (would only work for spells that already have a radius, like Fireball). More examples would be "Quicken" which has a very high mana cost but reduces the casting time of the following spell by 2; similarly "Certain" would make a spell cast afterwards uncounterable. "Heighten" makes it more difficult to resist the next spell. "Frostrhymed" would convert the damage type of the following spell to cold.

And so forth.