Its +10 power buff can easily help you threaten players with commander damage
It has an admittedly narrow use case, but tripling your attack force ends games quickly, and it helps generate long-game advantages with cards like Solemn Simulacrum and Baleful Strix
Can you pull high-value cards from Midnight Hunt
Use any of the typical untap effects available like Thornbite Staff and any sacrifice outlet, or just copy Zealous Conscripts over and over for an infinite number of token copies, ETB triggers, and untaps for Kiki-Jiki
The downside to Captain Rex Nebula is if the permanent you made into a Vehicle does damage, you'll have to sacrifice it as the crash land ability is mandatory
Ive also left in a couple of the biggest haymakers from the original list you cant reanimate Kefka or Umaro with Terra directly, but she can bring back a card like Priest of Fell Rites to do it for you