Ulmon, the Friendly Dragon

Legendary Dragons you control have
protection from red.
As long as an opponent controls 3 or more creatures, Ulmon gets +2/+0 and has flying.
Whenever you cast another legendary Dragon
spell, create a Dragon Treasure token. (It's an artifact with "{2}, {t}, Sacrifice this artifact: You
gain 3 life and draw a card." and "{t}, Sacrifice
this artifact: Add two mana in any combination
of colors.")