I think at least part of the reason is that people don't discuss peasant cube very much.

Also, this card's value takes hits in two ways in unpowered cube. First, it's obviously competing with a lot of extremely powerful cards. It's an environment where it's a bit harder for any 4/4 french vanilla to look attractive, especially due to the availability of hard wraths. Second, it loses a lot of the better "food" picks since unpowered has so few french vanilla keyword soup creatures.

In a typical unpowered list, the best cards it can eat are Mirran Crusader (just double strike), [[Drana, Liberator of Malakir]] (flying, first strike), [[Vampire Nighthawk]] (flying, lifelink, deathtouch), [[Griselbrand]] (flying, lifelink), [[Ash Zealot]] (first strike, haste), [[Chandra's Phoenix]]/[[Thundermaw Hellkite]]/[[Stormbreath Dragon]] (flying, haste), [[Hornet Queen]]/[[Baleful Strix]]/[[Dragonlord Silumgar]] (flying, deathtouch), and [[Sphinx of the Steel Wind]] (flying, first strike, lifelink, vigilance; probably the best choice). The Gods (indestructible) and various hexproof creatures might be worth it as well.

However, you're missing out on a lot of the most powerful options which you would find only in peasant lists. Cards like [[Aven Fleetwing]]/[[Ascended Lawmage]] (flying, hexproof), [[Aven Sunstriker]] (flying, double strike). It's really the loss of flying/hexproof that matters here. It's so hard to answer, although double strike makes it an insane clock if you can dodge removal.

That said, I still think it's a cool card. I think it can still be strong in unpowered and deserves to be tested. It's just a shame I cube exclusively on xmage for the time being, so I don't really have that option.