Featuring Assassins in every color as well as quite a few new legendary Assassins, Universes Beyond: Assassin's Creed allows you to play Assassins in almost any color pairing you desire
Frodo, Adventurous Hobbit + Sam, Loyal Attendant Another pair of partner commanders, Frodo, Adventurous Hobbit and Sam, Loyal Attendant work even better together than Merry and Pippin as perhaps the best Food commanders in Magic
Szarekh, the Silent King The problem with Szarekh, the Silent King is that needing to attack is a really slow trigger condition and one that you can only do once per turn
I love the power of this thing loads, but like the Carpet showed, there are a lot of flyers running around that will slip over the Castle's Moat
Outside of Standard, though, perhaps the competitive format most impacted by Final Fantasy is Duel Commander