I would argue that Kaalia is the most-played leader of all time, at least from where I'm sitting
Here are a couple: Cyan: Vengeful Samurai is not an easy card to get out given his high cost of 7 Mana, but this can easily be brought down as this number is decreased by one for every creature in the Graveyard
Crossroads Village Uncharted Haven cards arent technically a dual land, but they generally play like one
2-Color Town Cycle Baron, Airship Kingdom Gohn, Town of Ruin Gongaga, Reactor Town Guadosalam, Farplane Gateway Insomnia, Crown City Rabanastre, Royal City Sharlayan, Nation of Scholars Treno, Dark City Vector, Imperial Capital Windurst, Federation Center Final Fantasy includes a cycle of tapped dual lands with the town subtype
There is the FFVI deck starring Terra , FFVII starring Cloud, FFX starring Tidus , and FFXIV starring Yshtola
I was ready to dismiss him as just a boring humanoid monster, but this little detail makes him feel a bit more flavourful