Altac Bloodseeker is a uncommon Creature — Human Berserker card from Magic 2015 (M15), collector number 128. Current market price: $0.09 (foil $0.02), TCGplayer market prices via Scryfall.
Whenever a creature an opponent controls dies, this creature gets +2/+0 and gains first strike and haste until end of turn. (It deals combat damage before creatures without first strike, and it can attack and {T} as soon as it comes under your control.)