Ahnassi, Toad of the Guild

Ahnassi, Toad of the Guild cannot be blocked by
creatures with toughness 3 or greater.
Whenever you cast an instant spell from your
hand, if Ahnassi 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.)
"Be always clever. This is the secret to success, yes?"