Dominaria Undeterred

Whenever an opponent casts a blue spell, draw a
card.
Whenever an opponent casts a black spell, create
a 2/2 black Zombie creature token.
Whenever an opponent casts a red spell,
Dominaria Undeterred deals 3 damage to any
target.
Whenever an opponent casts a green spell, add
one mana of any color to your mana pool at the beginning of your next precombat main phase.