Oniblade Majesty

Haste, Menace
Whenever a creature dealt damage by Oniblade Majesty this turn dies, you gain 1 life and
Oniblade Majesty deals 1 damage to target player
or planeswalker. Whenever a creature blocks, that creature's controller loses 1 life.
A blade forged by the demonic cannot possibly be used
by hands intended for benevolence.