Fifth Edition

Cave People

If Cave People attacks, it gets +1/-2 until end of turn.
o1o
Ro
R, oc
T: Target creature gains mountainwalk until end of turn. (If defending player controls any mountains, that creature is unblockable.)

Whenever Cave People 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.)

Renaissance

Fourth Edition Foreign Black Border

Fourth Edition

When attacking, Cave People gets +1/-2 until end of turn.
1o
Ro
R, oc
T: Target creature gains mountainwalk until end of turn.

The Dark

If declared as an attacker, Cave People get +1/-2 until end of turn.
o1o
Ro
R, oc
T: Target creature gains mountainwalk until end of turn.