It won't turn any land into a basic land or remove the legendary supertype from a legendary land, and the lands won't be named "Island." If Harbinger of the Seas loses its abilities, it continues to turn nonbasic lands into Islands
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
It doesn't have evasion or useful utility, but it starts as an alright 2/1 and can slowly grow into a bigger threat as we cast our more expensive creatures, which helps us keep attacking with it
Theyre often red creatures, black creatures, blue creatures, or some combination therein
This allows you to ramp up the mana discount you can get from Rowan, Scion of War, pumping it all into a splashy bomb like Torment of Hailfire or Meathook Massacre II