Sacrificing two Humans to destroy a creature is just a net negative, and while exiling cards from graveyards is always relevant, it's not much to build around
This works against both targeted removal and effects like exile
Well, no, but if you're looking to build a low-power version of Inalla, Archmage Ritualist, this is a fine inclusion
Add on the previously mentioned Fountain Watch, and the only way anyone is getting rid of you is by a mass exile spell (which you can then avoid with a Guardian of Faith of Teferi's Protection)
It's decklist also has room for some excellent budget upgrades, too
Convoke has made an appearance in several sets on one-of designs, including Duskmourn: House of Horror , Modern Horizons 3 , and Marvels Spider-Man , as well as many Commander precon designs