There exists a total of five (maybe six) cards that have direct support for this archetype. Kron, Wings of Paradise, Aethermaster, White Widow, Astral Crusader, and sort-of-but-not-quite Dreamgazer. This is a huge shame, as Replace is (in my opinion at least) the most unique archetype in the game. It’s also vastly underwhelming because Dreamgazer and Astral Crusader are both barely playable memes. I tried to make a deck that had as much replace synergy as possible and made this:
Dreamgazer kinda works with Rancour.