Irabia, Wraithful Pride

Haste
Whenever a demon you control dies, each player is dealt 4 damage.
Pay X life: Look at the top X cards of your library and exile a card from it. You may cast it as long as it cost X or less to cast it. Put the rest into your graveyard. If you cast a spell this way, create a black 5/5 demon creature token with flying.