Kaito, Bane of Nightmares (Yes, we're aware this is a stretch on the definition we gave, but this clearly counts as a ninja)
More recently, there have been several waves of Elder Dragons, five new ones in Tarkir, redesigns of the original five in Core Set 2019, and a collection of college founders in Strixhaven
Theres an abundance of great spells here and honestly, they are all not perfect but get the job done
Serving as an easy draw engine in the command zone is strong in itself, but Marneus backs that up with an infinite mana outlet to boot
Ob Nixilis, Captive Kingpin Holy heck
Many unpopular cards that the developers (and most players) considered too weak and narrow in function were also removed, including the "Laces" (Chaoslace, Deathlace, Lifelace, Purelace, % 26amp