First up are leach spells. You may have one leach spell of every level spell you can cast, Take your under powered spells like say read magic or jump and what you do is say you are a 1st L mage and you have sleep memorized, you can take a leach spell like say Read Magic (shorter duration than normal ) and attach it to the sleep spell, you then can cast either spell, both of which are used up. You could make some that are exceptionally weak and let you have more than the restriction above, like say Detect Magic as a third L leach
Saying YES whenever you can(as long as it doesn't cost anything) is your job as DM.
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