Yeah,
Martial Coup came to mind for me as well, as it's in a similar class of spell. It was pretty busted, though, even in the earlier high-power iterations of my cube, so it got the axe pretty quickly.
Don't forget that on the other end of the spectrum,
Rebirth can make creatures a good deal larger than a 4/4, too. I cast multiple non-Rebirth
Wraths in my own cube today, and none was for fewer than four bodies, while one cleared out over eight. If you draft enough spot removal, it's not difficult to craft board states where you're not using your sweepers as one-for-one trades.
To be clear, I understand what everyone are saying, but with gold slots being as precious as they are - I imagine most of us run over fifty mono-coloured cards, but devote only four or five gold slots to each colour pair - I'm willing to take a modest reduction in power for a card that slots into a wider swath of decks. Like, we're talking about a card that's maybe a 9.5/10, versus a 9/10, but the latter makes zero demands of your manabase. These days, I'm less excited by the efficient utility spells in gold - your
Terminates and
Detention Spheres - and more by the build-arounds that will actively get drafters to consider a splash. As strong as
Magister of Worth may be, it doesn't feel like a particularly unique effect if you're already deep in white during a draft, compared to, say,
Sphinx's Revelation,
Unburial Rites, or
Ajani Vengeant. Especially when there exist multiple white Wraths that perform a similar function.