This land enters tapped unless you control a Plains or an Island.
{T}: Add {W} or {U}.
"Iceworld. A space trading colony on the dark side of the planet Svartos... I think there's something interesting going on there, Mel."
—The Seventh Doctor
Legalities
tlrlegal
duellegal
brawllegal
pennylegal
PreDH
Rulings · 2
wotc
This checks for lands you control with the land type Plains or Island, not for lands named Plains or Island. The lands it checks for don't have to be basic lands. For example, if you control Watery Grave (a nonbasic land with the land types Island and Swamp), Glacial Fortress will enter untapped.
wotc
As this is entering, it checks for lands that are already on the battlefield. It won't see lands that are entering at the same time (due to Warp World, for example).
Notes
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