Ooga Booga, Chaos Mage

Whenever a spell in play or a spell being cast causes you to roll one or more dice do one of the following effects according to the colour of the spell (a spell that is two or more colours causes all of the abilities to trigger according to the corresponding colours).
If the spell is {w} create a 2/2 white monkey token if the spell is {u} scry 1, if the spell is {b} each opponent loses 1 life, if the spell or is {r} draw a card and discard a card if the spell is {g} put a trample counter on target