Trunks, Hope of the Future

Instant and sorcery spells you control
can't be countered by spells or abilities.
Whenever you cast an instant or sorcery
spell from your hand, if Trunks, Hope of
the Future attacked this turn, that spell
gains rebound.(Exile the spell as it
resolves. At the beginning of your
next upkeep, you may cast that card
from exile without paying its mana cost.)