Heartfire Hero can very quickly grow in stats, and burn for its power whenever it dies
Even later games like my favorite, Nightmare Troubadour, would have issues like this because theres a lot of logic required for certain effects to work properly
Avatar Aang / Aang, Master of Elements I'm not usually the biggest fan of five-color commanders, but Avatar Aang is a tier above the generic good-stuff leaders we usually get
Nonetheless, Silk, Web WeaverSilk, Web Weaver makes good use of it: It almost ensures you're going to get the bodies needed to recast it and it can also count on a nice board-pumping ability that synergizes very well with its threatening static ability
That's why many fans gravitate toward just a few, such as Standard and Commander