Vargath, the Hatesayer

Haste
Whenever another creature you control dies, you may pay {5}. If you do and {r} was spent to pay this cost, Vargath the Hatesayer deals damage equal to that creature's converted mana cost to target creature or planeswalker. If you do and {w} was spent to pay this cost, you gain life equal to that creature's converted mana cost. If you do and {b} was spent to pay this cost, each opponent loses life equal to that c