Sheogorath, The Wicked

Cascade
Whenever you cast a non-creature spell, roll a D20.
1 - 5 | Create a treasure token.
6 - 10 | Copy target spell, Choose the target for the copy at random.
11 - 15 | Each player sacifices a creature at random.
16 - 19 | Until end of turn, the next spell you cast
has cascade.
20 | Exile all non-land permanents.