Voice of Victory is a rare Creature — Human Bard card from Tarkir: Dragonstorm Promos (PTDM), collector number 33p. Current market price: $18.12 (foil $20.81), TCGplayer market prices via Scryfall.
Mobilize 2 (Whenever this creature attacks, create two tapped and attacking 1/1 red Warrior creature tokens. Sacrifice them at the beginning of the next end step.) Your opponents can't cast spells during your turn.