The stack is first in, last out meaning that when multiple effects are cards are on the stack, the most recent effects and cards resolve first
Theres a lot of sacrificing and burning going on, but Streets of New Capenna and Warhammer 40K gave us demon commanders that splash into other colors and do other things, and Final Fantasy brought quite a handful of demons too
Once you can untap with it, youll have a strong presence on the board, gain some life, and even protect the Exemplars from removal
From personal experience, I will also add that if you thought a post boardwipe Scavenging Ooze was strong, try giving it trample and card draw
The first one released was Shivan Dragon at MagicCon Philadelphia, the second one was Giant Growth at MagicCon Minneapolis, the third was Lord of the Pit at MagicCon Barcelona, the fourth one was Merfolk of the Pearl Trident at Gen Con, and the fifth one was Swords to Plowshares at MagicCon Vegas