The tag alias #56097 rbst -> mrsakai has been approved.

Reason: Same artist: rbst, mrsakai. Some posts are tagged with both: rbst mrsakai

EDIT: The tag alias rbst -> mrsakai (forum #324093) has been approved by @bitWolfy.

Source report: Of the images in rbst, most of them have a source link to this Hentai Foundry profile, which has a link to the mrsakai patreon.
post #1479820 and post #1526174 have source links that tumblr grudgingly redirects to this account which also links to the mrsakai patreon in the first post.
Of the remaining images, post #999310 has no source, and post #1522551 has two dead source links. They have about the right style and the same signature. I found no conflicting artist names.

The tag alias rbst -> mrsakai (forum #324093) has been approved by @bitWolfy.