Warhost's Frenzy is a uncommon Instant card from Dominaria United (DMU), collector number 151. Current market price: $0.17 (foil $0.21), TCGplayer market prices via Scryfall.
Kicker {B} (You may pay an additional {B} as you cast this spell.) Creatures you control get +2/+0 until end of turn. If this spell was kicked, whenever a creature you control dies this turn, draw a card.