Okira, Heart of the world

Okira, Heart of the world enters the battlefield tapped
Whenever you cast a blue spell, draw X cards, where X is 3 Minus that spells converted manacost
Whenever you cast a green spell, put a 3/3 green beast creature token onto the battlefield.
Whenever your opponent casts a blue spell, if its the first spell they cast this turn, counter it.
Whenever an opponent casts a green spell, create a 1/1 bird creature token with flying