Herald of Harvest

Flying
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Herald of Harvest gets +1/+0 for each Plains you control.
Herald of Harvest gets +0/+1 for each Forest you control.
Untapped potential rises just below the surface and is withheld until the moment is right.