Most counterspells are blue cards, and specifically blue instants, as its what blue does best, but there are more than a few playable off-color counterspells
, , Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle
Totentanz, Swarm Piper Totentanz, Swarm Piper makes for a good Rakdos sacrifice commander since youll be able to get two bodies out of any nontoken creature you play
Blackbloom Rogue / Blackbloom Bog Blackbloom Rogue is a rogue creature that also cares about mill decks, as many rogue tribal decks do
Every card here can be played alongside regular, non-Final Fantasy cards
Queza, Augur of Agonies often sees at least some wheels in its lists, but you could run it like a group hug commander with Howling Mine effects