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Rulings
Nimbus Maze's last two abilities check the subtypes of lands you control, not their names. You can activate the appropriate abilities as long as you control a land with the corresponding subtype, Plains or Island. Most nonbasic lands don't have basic land types, even if they produce colored mana. For example, Nimbus Maze itself is neither a Plains nor an Island, while Hallowed Fountain is both.
Rulings
Nimbus Maze's last two abilities check the subtypes of lands you control, not their names. You can activate the appropriate abilities as long as you control a land with the corresponding subtype, Plains or Island. Most nonbasic lands don't have basic land types, even if they produce colored mana. For example, Nimbus Maze itself is neither a Plains nor an Island, while Hallowed Fountain is both.
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