Aurora Awakener
Trample Vivid — When this creature enters, reveal cards from the top of your library until you reveal X permanent cards, where X is the number of colors among permanents you control. Put any number of those permanent cards onto the battlefield, then put the rest of the revealed cards on the bottom of your library in a random order.
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Official rulings (5) · Scryfall
The colors are white, blue, black, red, and green. Colorless is not a color.
Lands are normally colorless permanents, even if they tap for mana of a certain color.
An Aura being put onto the battlefield this way can't enchant anything else that is being put onto the battlefield at the same time.
The value of X is calculated only once, as Aurora Awakener's triggered ability resolves.
If an Aura is put onto the battlefield without being cast, the Aura's controller-to-be chooses what it will enchant as it enters the battlefield. An Aura put onto the battlefield this way doesn't target anything (so it could be attached to an opponent's permanent with hexproof, for example), but the Aura's enchant ability restricts what it can be attached to. If the Aura can't legally be attached to anything, it remains in its current zone.