In the Kalamar setting there seems to be a feat which to me sounds a little overpowered called Miser with Magic.
Here it is in full for query:
Your character draws upon the minimum amount of arcane energy needed to cast a spell.
Prerequisite: Caster level 7th
Benefit: You can make a Spellcraft roll to retain the use of a spell after you cast it. The spellcraft DC is 10 +twice the spell's level. If you succeed, you managed to conserve enough magical energy, from this and other spells you have cast, that the spell (or spell slots for sorcerors) is not considered spent and may be used again. You may only use this ability on a number of spell levels equal to the ability score modifier appropriate to the type of spells you cast (charisma for sorceror or bard spells for example)
Special: If you fail the roll by 5 or more, you spent insufficient energy to cast the spell at all. You lose the spell or the spell slot, and the spell has no effect.
Now, the way I see it you can effectively gain in most probability a level 5-9 spell depending on level, since your spellcraft should usually be quite high enough to make the skill check. For example, a 20 Int wizard with this feat could roll a check and if he succeeds, he keeps a level 5 spell. If this is the limit of his daily savings, then the feat seems quite poor depending on the level it is gained when you compare it to the extra spell slot feat. But if you can keep retrying to save spells like this all day, I can see the feat being very overpowered as you could effectively cast 1st level spells all day with no chance of failing the check.
What do you guys think?
Here it is in full for query:
Your character draws upon the minimum amount of arcane energy needed to cast a spell.
Prerequisite: Caster level 7th
Benefit: You can make a Spellcraft roll to retain the use of a spell after you cast it. The spellcraft DC is 10 +twice the spell's level. If you succeed, you managed to conserve enough magical energy, from this and other spells you have cast, that the spell (or spell slots for sorcerors) is not considered spent and may be used again. You may only use this ability on a number of spell levels equal to the ability score modifier appropriate to the type of spells you cast (charisma for sorceror or bard spells for example)
Special: If you fail the roll by 5 or more, you spent insufficient energy to cast the spell at all. You lose the spell or the spell slot, and the spell has no effect.
Now, the way I see it you can effectively gain in most probability a level 5-9 spell depending on level, since your spellcraft should usually be quite high enough to make the skill check. For example, a 20 Int wizard with this feat could roll a check and if he succeeds, he keeps a level 5 spell. If this is the limit of his daily savings, then the feat seems quite poor depending on the level it is gained when you compare it to the extra spell slot feat. But if you can keep retrying to save spells like this all day, I can see the feat being very overpowered as you could effectively cast 1st level spells all day with no chance of failing the check.
What do you guys think?