({4} magic symbol) , plus enough mana to pay for the nonland card's mana cost minus ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) available.
Activate Necrotic Ooze using Leech Bonder's ability by paying ({U} magic symbol) and untapping it.
Repeat as desired, skipping step 2 on the final iteration.
Cast any spell by paying its mana cost, reduced by the ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) added in step 1.
Necrotic Ooze triggers for each time you activated Codie's ability.
Resolve the first trigger, causing you to exile cards from the top of your library until you exile an instant or sorcery spell with lesser mana value, and allowing you to cast that spell without paying its mana cost.
Repeat step 6 for each remaining trigger.
You may also repeat this combo for each nonland card in your hand as mana permits, and on subsequent turns.
Results
Cast all instants and sorceries in your library with mana value less than spells you cast.