Bartzabel, who Declares War

Flying, Menace
Invocation of War
At the beginning of combat on your turn, you may exile a creature card from a graveyard. If you do, create a token that’s a copy of it. It gains haste. Sacrifice it at the beginning of your next end step.
Word That Openeth Hell
{x}{b}{r}, Sacrifice X creatures : Exile the top X cards of your library. You may play any number of those cards this turn without paying their mana costs.

"By the word that openeth Hell, I call forth
warriors eternal."