Cave People is a uncommon Creature — Human card from Fourth Edition (4ED), collector number 181. Current market price: $0.15, TCGplayer market prices via Scryfall.
Whenever this creature attacks, it gets +1/-2 until end of turn. {1}{R}{R}, {T}: Target creature gains mountainwalk until end of turn. (It can't be blocked as long as defending player controls a Mountain.)