I feel this set desperately needs a Soulstinger-like mechanic considering how many of these cards you are making.

Your wither variant (choke on dust) is clashing with this in a bad way - and so are the plenty of -1/-1 counter cards that work well as removal. You need straight up Bloodied Ghosts.

Choke on Dust is primarily in red and green this set. But having two cards with a similar basis (I forgot about Images of Illness when designing this) is too much. With Study the Illness and Unrelenting Dust, both at common, a single one of these types of effects is probably okay though. However, this decision means Belltower Bat should be changed as well. This card will be changed in the future.

This is an instant to protect from graveyard removal

This has a bit much going on for a common, don't you think? Considering this is essentially a modal spell that lets you cast a creature card from your graveyard vs. create a Gold token.

The top-down is cool when it flows well, but a delayed trigger and everything. That's even before counting the weird way the timing is of between being able to cast that card "until end of turn", but only returning it to the graveyard "at the beginning of your end step".

I gave up on having orderly and tidy commons because I find them boring to see and design (the latter is a flaw of my own, though the former I hold no remorse for having).

That being said, do I need to clarify that you could only cast the spell during normal times, or is that already implied by cast (as this is instant speed, a player may use this during an opponent's turn to save something from a Bojuka Bog). How would I resolve the timing issue? "If the card exiled this way is still in exile at the beginning of endstep, return it to your graveyard. Otherwise, create a Gold token." Wait, did I just make the simple goof (lack of proofreading) that UEOT vs your endstep. "[N]ext endstep: instead of "your endstep" fixes this, correct?