Sethron, Defensive Battlemage

Exile an instant or sorcery card from your hand
with converted mana cost X: choose one—
• Return target creature with converted mana
cost X to its owner's hand.
• Change the target of target spell with converted
mana cost X that targets you or a permanent you control.
{t}: Cast target instant or sorcery card exiled with Sethron without paying its mana cost.