Bloodbraid Elf is a uncommon Creature — Elf Berserker card from Alara Reborn (ARB), collector number 50. Current market price: $0.33 (foil $1.78), TCGplayer market prices via Scryfall.
Haste (This creature can attack and {T} as soon as it comes under your control.) Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)