If you call it right, destroy all chosen permanents
These cards don't represent their set counterparts
Amonkhet gave us a very similar cycle of dual lands like Canyon Slough as recently as 2017, and these lands werent as well received as counterparts like Temple Garden or Cinder Glade
"Order and no luck": Absolutely the most important thing in mill deck: there are too many strong/medium cards, and combine them together is very very very difficoult
While Kaalia works with all three of these creature types, if a player wanted to go all in on a Mardu Dragon deck while ignoring demons and angels, Kaalia could enable such a strategy quite well
they work well with Omnath, but also all the evoke elementals like Endurance, Fury, and Mulldrifter