Whenever Cave People attacks, it gets +1/-2 until end of turn.

, : Target creature gains mountainwalk until end of turn. (It can't be blocked as long as defending player controls a Mountain.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)

I — Create two 3/3 green Dinosaur creature tokens.

II — Roar of the Fifth People gains "Creatures you control have ‘: Add , , or .'"

III — Search your library for a Dinosaur card, reveal it, put it into your hand, then shuffle.

IV — Dinosaurs you control gain double strike and trample until end of turn.