Since Terra doesnt bring the reanimated creature back tapped and attacking, its a fundamentally less aggressive commander, but the lower mana cost to reanimate the creature gives you more flexibility on the turns you use the ability
and now it's barely played
Some of the humans even happen to be fairly exciting to cheat out (i.e., Gladiolus Amicitia)
These decks often include red, splash blue, deck wins, counter burn, UW weenie, UB fairies style agro control and various mono blue creature decks with things like Vedalken Shackles, Grand Architect and Opposition
If you want to try out a new Final Fantasy Commander and you want to win a lot of games, then these are the cards for you
While I might like more variety, I see how graveyards play thematically with what a lot of insects do, and it makes it easier to run a lot of legendary insects together in the same deck