Rat Magic Learner

Rat spells you cast cost {1} less to cast. Rat spells you cast cost {2} less to cast if you control another Rat Magic Learner. Rat spells you cast cost {3} less to cast if you control two other Rat Magic Learners. Rat spells you cast are free is you control three other Rat Magic Learner. Rat Magic Learner gain Trample, Lifelink, Deathtouch, Doublestrike, flying, and +10/+10 if you control four other Rat Magic Learners.
{5}{b}{b}{b}{t}: Create a copy of this creature.