Benthic Anomaly

Devoid works in all zones, not just on the battlefield.

If the copied creature is copying something else, then the token enters the battlefield as whatever that creature copied, with the listed exceptions.

A card with devoid is just colorless. It's not colorless and the colors of mana in its mana cost.

The token is an Eldrazi creature instead of its other types and subtypes and is colorless instead of retaining any of its colors. It retains any supertypes it had, such as legendary or snow. These are copiable values of the token that other effects may copy.

The token copies exactly what was printed on the original card and nothing else, with the listed exceptions (unless that creature is itself copying something else; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.

If a card loses devoid, it will still be colorless. This is because effects that change an object's color (like the one created by devoid) are considered before the object loses devoid.

Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any "as [this creature] enters the battlefield" or "[this creature] enters the battlefield with" abilities of the creature will also work.

Benthic Anomaly's triggered ability will resolve before Benthic Anomaly does. If Benthic Anomaly is countered or otherwise leaves the stack in response to that triggered ability, the triggered ability will still resolve as normal.