MTG Salvation

Hi I have a question concerning Grixis Grimblade. It says: As long as you control another multi-colored permanent Grixis Grimblade gets +1/+1 and has deathtouch.
So my question is: Are non-basic lands (such as Overgrown Tomb and Dragonskull Summit) considered multi colored permanents? I know lands are permanents... so are lands that give more than one color mana considered multicolored permanents? Grixis Grimblade

Since I lack any and all computer skills and I don't even know how to make Cardtags here is a picture of the cards.

Hi there is this card I would love to add to my deck called Grixis Grimblade. It says: As long as you control another multicolored permanent, Grixis Grimblade gets +1/+1 and has deathtouch. So my question is: if you have a non-basic land (for example Overgrown Tomb or Dragonskull Summit) will Grixis Grimblade get his boost? I know lands are permanents. But are lands that give more than one mana color considered as multicolored permanents?

Pepe.... Gamer name Phebeus.