Konda's Banner can be attached only to a legendary creature.
Creatures that share a color with equipped creature get +1/+1.
Creatures that share a creature type with equipped creature get +1/+1.
Equip {2}
A creature can’t get more than +2/+2 from Konda’s Banner. Sharing more than one color or more than one creature type with the equipped creature does nothing.
The equipped creature shares a color with itself, as long as it has one or more colors.
The equipped creature shares a creature type with itself, as long as it has one or more creature types. “Artifact” is not a creature type.