Lucina, Future Witness

During your declare attackers step you may pay {3}, put this card from your hand tapped and attacking. Return this card to your hand at the
end of your combat phase.
Suspend 3 - {1}{w/u}{w/u} (Rather than cast this card
from your hand, you may pay {1}{w/u}{w/u} and exile it
with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is
removed, cast it without paying its mana cost. It has
haste.)