Waxen Shapethief not copying Elvish refueler passive ability
Encountered a bug with Waxen Shapethief and Elvish Refueler. I had an Elvish Refueler on the battlefield that has been enchanted by my opponent's Flood the Engine. I cast Waxen Shapethief to copy my Elvish Refueler and while I could use it's own Exhaust ability I was not able to use any of my other creatures exhaust abilities as intended by an Elvish Refueler.

-
Cryoghoul#37224 commented
Encountered a bug where having Marvin, Murderous mimic and Elvish Refueler in play disables the Elvish Refueler exhaust extra.
-
Jumpy#28730 commented
I also just encountered this issue in a premier draft.
Flashed in a Waxen Shapethief to get a copy of my Elvish Refueler which was about to die, to keep the combo alive which I had with a Stampeding Scurryfoot. But I could not activate the Stampeding Scurryfoot any longer and therefore had to concede the game :( -
Fr33dan#50962 commented
I had a similar issue with different circumstances. I made Mimeoplasm into a copy Elvish Refueler. The result is the same, it had no static ability. It's not just that the ability doesn't work on the copy, it is as though the ability wasn't copied at all. I was able to activate the Exhaust ability once as intended though.