Bolt Bend and Redirect Lightning come close, but free spells are great, and Deflecting Swat can shift the game real fast if youre able to redirect the right spell
Still, in the right hands, Felothar delivers a steady march toward victory that feels uniquely Abzan
As such, with Rhystic Study being such a pricey card on its own, and with existing, available copies of Stay with Me mostly declining in numbers over time, getting the card is not going to be easy or accessible to the general public
That being said, you can make it a little less omnipotent
Cards from the Assassins Creed set benefit this commander immensely, but cards in the original Ixalan or The Lost Caverns of Ixalan also support this strategy, and you can find other good vehicles in sets like Kaladesh
1 The Ur-Dragon