Sowing Mycospawn

Devoid (This card has no color.)
Kicker {1}{C} (You may pay an additional {1}{C} as you cast this spell.)
When you cast this spell, search your library for a land card, put it onto the battlefield, then shuffle.
When you cast this spell, if it was kicked, exile target land.

Modern Horizons 3

Devoid
Kicker {1}{C}
When you cast this spell, search your library for a land card, put it onto the battlefield, then shuffle.
When you cast this spell, if it was kicked, exile target land.

Modern Horizons 3 Promos

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

Devoid doesn't affect the color identity of the card for the purposes of the Commander variant. For example, while Abstruse Appropriation is colorless because it has devoid, its color identity is still white and black, and it can't be included in a Commander deck where the commander's color identity doesn't include both white and black.

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

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.

Other cards and abilities can give a card with devoid a color. If that happens, it's just the new color, not that color and colorless.

Sowing Mycospawn's triggered abilities will resolve before Sowing Mycospawn does. If Sowing Mycospawn is countered or otherwise leaves the stack in response to those triggered abilities, the triggered abilities will still resolve as normal.