Its nice that this green enchantment costs only 2 mana, and you start reaping the rewards immediately with the lifegain
Lost Auramancers Lost Auramancers is the slowest, most telegraphed way to search for an enchantment, and your opponents get three full turns to remove it before the ability triggers
Its especially strong with huge enchantments like One with the Multiverse and token engines such as Sigil of the Empty Throne, turning every miracle draw into a major spike in value
Your opponent doesn't have a great attack backthey could offer to trade the Colossapede with your two other creatures, but you'd likely take the hit and attack right back
It would also cause chaos for people who didnt want to give up their older cards, perhaps because of collector and sentimental reasons
Instant is no big deal and so it is just a high risk 3 drop single ramp spell