Sisay, Yagmoth's Hand

Haste, First Strike, Deathtouch
Whenever Sisay, Yagmoth's Hand attacks, you may discard a card. If you do, exile that card. Each opponent loses life equal to the discarded card's converted mana cost. You may cast that card without paying its mana cost as long as it remains in exile this way.
Yagmoth turned the once coveted captain of the Weatherlight into its demise.