Here are my general guidelines for deciding whether to name Human, Illusion, or Wizard in those spots: If you have an Aether Vial on the battlefield, you should prioritize Mantis Rider or Deputy of Detention above Phantasmal Image
(Artifacts, legendaries, and Sagas are historic.) The second mode of What Must Be Done cares about what the characteristics of the returned permanent will be when it's on the battlefield, taking into account static abilities that would change its types
[casthaven]Gyre Sage[/casthaven]
If it's a likely hit for Standard or Modern but a swing and a miss for formats like Commander and multiplayer, then it's not here
Other cards, like Hedron Archive, are perfectly acceptable in a non-Green deck, but we have plenty of better alternatives at the same budget range, like Explosive Vegetation
You can check out the cards from the Warhammer 40,000 Commander decks in the Card Image Gallery