Rukol, Lacerator Paragon

Double strike, Trample, Haste
Whenever a player loses life, you may add X mana in any combination of {b} and/or {r} to your mana pool, where X is equal to the amount of life lost.
Rukol, Lacerator Paragon costs {1} less to cast for each 1 life your opponents have lost this turn.
"Your veins sing so saccharine a threnody..."