Asari, Champion of Bolas

+5: Summon an 8/8 dragon token with flying with "whenever this creature deals combat damage target opponent discards two cards"
-5: Exile target Permanent. Gain life equal to its CMC. return target permanent to the battlefield under your control
-20: Search your library for any number of nonland cards and put them onto the battlefield. Transform Asari into Asari, Goddess of Witches