Piggy Bank

Strategy and Synergy
Pretty straightforward artifact, granting 4 money upon taking a spell. Since spells are given as a reward from completing dangerous zones, you can quickly rack up some balance as you progress through the run.

Is more effective if taken earlier on the run, since the closer you are to Eden, the fewer the battle zones will be (though you can attain extra spells via the Shopkeeper, but ironically you'll lose up the attained money in the process, resulting in a meager 4 Sera discount for that item).

This artifact is effective on Execute Shiso since his grows stronger the more  you have.