Artifact — Equipment
Equipped creature gets +X/+X, where X is the number of Forests you control.
Whenever equipped creature attacks, create a 1/1 green Forest Dryad land creature token. (It's affected by summoning sickness.)
Equip
Forest is a land subtype. Dryad is a creature subtype. If an effect causes the token to have a different land subtype, that won't affect its creature subtypes (or color), and vice versa.