Purge The Multimatrix

Spend only one color or mana to cast this spell.
Colorless mana cannot be used to cast this spell.
Exile the top 15 cards of your library. Then, if you exiled at least 3 red cards this way, Purge the Multimatrix deals 5 damage to target player. If you exiled at least 3 green cards this way, put 5 +1/+1 counters on target creature. If you exiled at least 3 blue cards this way, draw 3 cards. If you exiled at least 3 black cards this way, destroy 2 target creatures. If you exiled at least 3 white cards thi