River Song vs Grizzly Mastodon: who would win?

Grizzly Mastodon favored — Favored (~65%)

River Song · Doctor Who · Base

Tier

7-B

Attack Potency

City Level

Speed

Average Human

Durability

Small Building Level

Grizzly Mastodon · Dungeons & Dragons · Base

Tier

LOW 7-B

Attack Potency

Small City Level

Speed

Relativistic+, up to Ftl+

Durability

Small City Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.