I have no idea what the correct balance for the four aforementioned cards is, but having more pieces in our toolbox to fully streamline the deck cant be a bad thing
C Common Jar of Avarice X TRAP Target 5 cards in your GY, except "Jar of Avarice"
In a combo-heavy deck (like synchro decks tend to be), this is fantastic at replenishing your resources and for giving you even more monsters to synchro summon with
You might even find some on-theme sleeves for your next deck, like these Izzet sleeves for your Niv-Mizzet deck
On top of that, this creature even comes with removal evasion, as simply killing this creature will create a token of itself (and then gives the owner another free card draw and 3 life), so you'll have to exile this to really get rid of it
This card features the same impressive artwork as the Staff version and is a must-have for anyone looking to add rare Prerelease cards to their collection