Magnos, the Raging Storm

Flying, First Strike
Whenever you cast an instant or sorcery spell
from your hand, if Magnos, the Raging Storm is tapped, that spell gains rebound.
As long as Magnos, the Raging Storm is in your graveyard, each instant and sorcery card in your graveyard gains flashback. The flashback cost is
equal to its mana cost.