Barbaduke, Cuisine Master

When Barbaduke, Cuisine Master enters the battlefield, create two 1/1 white Goblin Cooks creature tokens.
Other goblins you control get +1/+1.
Whenever you cast a spell, you gain X life, where
X is the number of different colors amongst the
mana you spent to cast it.
"Mr Grubbs, this smells nice. Explain."