Barbtooth Wurm

In Commander, Barbtooth Wurm sits at the bottom of the curve for green fatties — reach matters occasionally against flier-heavy decks, but six mana buys you far more threatening bodies with enters-the-battlefield effects. Pauper is the only format where Barbtooth Wurm earns genuine consideration, since the card pool shrinks enough that a 5/4 reach at common can do real blocking and attacking work in slower green stompy shells. Legacy and Vintage are legal on paper but irrelevant in practice — those formats don't run six-mana 5/4s without an engine attached. Oathbreaker shares Commander's problem: the 58-card deck still has access to better options at this cost.