Lost Dreams Serenade

(As this Saga enters and after your draw step, add
a lore counter. Sacrifice after IV.)
I, II, III, IV - Exile target instant or sorcery
card with mana value equal to the number of
lore counters on Lost Dreams Serenade from
a graveyard. Copy that card. You may cast the
copy without paying its mana cost.
"At the brink of unlife, fleeting dreams are given a
final breath."