Yazuki Yoshino

Double Strike, Vigilance
Whenever you counter or copy a spell an opponent controls, Yazuki Yoshino deals damage to that spell's controller equal to its converted mana cost. Until end of turn, all spells in your graveyard with flashback gain flash.
Cards with flashback in your graveyard cost X less, where X is the damage Yazuki Yoshino has done to an opponent this turn.