Mercurial Spelldancer

Mercurial Spelldancer can't be blocked.

Whenever you cast a noncreature spell, put an oil
counter on Mercurial Spelldancer. Whenever
Mercurial Spelldancer deals combat damage to a
player, you may remove two oil counters from it.
If you do, when you cast your next instant or
sorcery spell this turn, copy that spell. You may
choose new targets for the copy.