Riven Of A Thousand Voices

Vigilance, Menace
When this or another creature you control attacks, exile up to 4 target creatures until end of turn.
Whenever an opponent cast a creature spell you may create a black 1/1 Taken Warrior token.
{u}{b}{r}, pay X life: You may draw X cards. Active this ability during your precombat mainphase. You may not attack this turn.
"Boons I grant you, oh bearer mine,
but debts must be paid in time."