Kerban, Divided Devotee

Whenever you would cast your first instant
spell each turn, if Kerban is untapped, you
may tap Kerban and pay {u/r}. If you do, copy
that spell. You may choose new targets for
the copy.
If an opponent would cast an instant spell
while Kerban is tapped, you may return him
to your hand. If so, copy that spell. You may
choose new targets for the copy.