Xareta, Temporal Necromage

Whenever you cast a spell from your graveyard,
if that spell was an instant or sorcery, you may
copy it.
Exile 5 cards with flashback from your graveyard :
Instants and Sorcery you control gain flashback
until end of turn, their flashback cost is equal to
their converted mana cost minus {1}.
" The past can never been forgotten, so you must
learn to cherish it. "