Ring of Spell Storing

This ring stores spells cast into it, holding them
until the attuned wearer uses them. The ring can
store up to 5 levels worth of spells at a time.
While wearing this ring, you can cast any spell
stored in it. The spell uses the slot level, spell
save DC, spell attack bonus, and spellcasting
ability of the original caster. The spell cast from
the ring is no longer stored in it, freeing up space.
By failing to prepare, you are preparing to fail.