What do you the Avatar standard will be?
My guesses:
Monoblack decks of all varieties become more common because it's the one color without a set specific mechanic which means they will make the cards more powerful to compensate (white gets airbending, blue-waterbending, green-earthbending, red-firebending)
Control decks with white in them get bigger because of a one mana white spell with airbend (exile, cast for 2 more) on it
Blue artifacts might get bigger because they can convoke this card with an artifact