Alharama, Death Fanatic

Menace, lifelink,
Whenever a creature with converted mana cost 3
or less dies, you may pay {3}{w}. If you do, you
gain life equal that creature's toughness.
Whenever a creature with converted mana cost 4
or greater dies, you may pay {5}{b}. If you do, that
creature's controller loses life equal to that
creature's power.