Berserker's Frenzy is a rare Instant card from Forgotten Realms Commander (AFC), collector number 29. Current market price: $2.12, TCGplayer market prices via Scryfall.
Cast this spell only before combat or during combat before blockers are declared. Roll two d20 and ignore the lower roll. 1—14 | Choose any number of creatures. They block this turn if able. 15—20 | You choose which creatures block this turn and how those creatures block.