Bloodbraid Challenger is a rare Creature — Elf Berserker card from Modern Horizons 3 Commander (M3C), collector number 70. Current market price: $0.95, TCGplayer market prices via Scryfall.
Cascade Haste Escape—{3}{R}{G}, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)