"The Cloud Nacatl sit and think, a bunch of soft paws. We are the Claws of Marisi, stalking, pouncing, drawing blood."

Wild Nacatl

This creature gets +1/+1 as long as you control a Mountain.
This creature gets +1/+1 as long as you control a Plains.

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Wild Nacatl gets +1/+1 as long as you control a Mountain.
Wild Nacatl gets +1/+1 as long as you control a Plains.

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Wild Nacatl's abilities check for lands with the subtypes Mountain and Plains. Those lands don't need to be named Mountain and Plains. Wild Nacatl will get both bonuses if those two subtypes are contained among the lands you control, even if they're from the same land (such as Plateau or Sacred Foundry).