Tzeentch, the lord of change

At the start of your turn, roll a d20, the number rolled it the number of devotion to black, blue, and red you need for tzeentch, the lord of change to not be a enchantment.
While a creature, at the start of your turn, roll 2 d6, choose the numbers rolled to be tzeentch, the lord of change strength and toughness.
When you cast or copy a instant or sorcery, you roll a d20, if the roll is a 1-10, the instant or sorcery is countered, if the roll is 11-20, y