Both cost just one mana, and both can put themselves into the graveyard early so theyre ready for Xu-Ifit when it drops
Spandam Turn 3 (5 Don): to remove their Character development or if theres nothing to KO play Brook or Kalifa to filter hand and trash cards
Ratcatcher Trainee is a reasonable, if unexciting, body, but the fact that you can also make two tokens with the Adventure makes it a bit more enticing
Thassa, Deep-Dwelling Thassa, Deep-Dwelling is a god all about controlling the field
I slip them in front of Corrupt because creatures are naturally more valuable (especially with lifelink) and easier to trigger again with a reanimation, flicker, or some other reuse
WARGATE Tutors are incredibly important in a singleton format like Commander