The White Witch

This spell costs {1} less to cast for each snow
permanent you control
When The White Witch enters, tap up to three
nonland permanents and put three stun counters on
each of them.
Whenever The White Witch attacks, you may gain control of up to one target non-snow creature
defending player controls. If you do, tap it and put a
stun counter on it. That permanent becomes a snow permanent in addition to its other types.