Chapvat, God of the Primal

Indestructible
As long as your devotion to red, green, and white
is less than nine, Chapvat isn't a creature.
Whenever a creature you control attacks, until
end of turn, it gets +1/+1 and gains trample if
you control a Forest, gets +1/+1 and gains
menace if you control a Mountain, and gets
+1/+1 and gains vigilance if you control a Plains.