The addition that the ability can only be used once per turn takes away some of the Commanders speed and makes progress in the dungeon slow if there are not enough creatures on the field to dare constant repetitive attacks or block enemy ones
It prevents all damage not just combat damage that would be dealt by creatures your opponents control
That made it impossible for ordinary fans to get their hands on the most exciting expansion for several years, and coveted cards such as the Shiny Charizard VMAX card
Disciple of Freyalise can convert Ghalta into 12 life and 12 cards, while Xenagos, God of Revels transforms Ghalta into a 24/24 trampler with haste
It either preys on newer/less skilled players, or it flounders against savvy players, who know not to take the tempting offer, and a pod full of them will turn this into an overpriced ramp spell
I rarely held onto this to cast it for , but sometimes you're limited in Limited