Oliphaunt

Like Generous Ent (61), one-mana landcycling puts a sizable creature in the graveyard; Mountain access and 6 power make it a credible complementary role-player.

Could be wrong if It needs a competitive graveyard/cascade shell that values Mountain access; otherwise it is merely a six-mana creature.

Mountaincycling is useful setup, but unlike free Street Wraith (67), it costs mana and its six-mana body is not exceptional for Legacy.

Could be wrong if A resilient Legacy graveyard or cascade shell could value the landcycler body more than expected.

Generous Ent (75) shows one-mana landcycling has a real home; Oliphaunt trades Ent's sturdier body for red fixing and a more threatening attack trigger.

Could be wrong if It may be crowded out by stronger landcyclers and six-drops, especially if red ramp/cascade shells lack room.

Cheap Mountain fixing plus a trampling body is usable in red combat decks, but six-mana attack-only value is highly replaceable in multiplayer.

Could be wrong if Dedicated Elephant typal or attack-trigger strategies could create more demand than general red decks do.

A 6/4 trampler that adds +2 power and trample to another attacker is a meaningful top-end threat, while Mountaincycling helps hit land drops.

Could be wrong if Set speed, removal density, fixing, and red's curve are largely unrevealed; a fast format could make six mana too slow.