Karlach, Tiefling Spellrager

Card text

First strike, haste

When this card specializes from your graveyard, return it from your graveyard to the battlefield. It perpetually gains "This creature can't block."

When this card specializes from any zone, seek an instant or sorcery card with mana value 3 or less. Until end of turn, you may cast that card without paying its mana cost.