Of note, the precon does not have Swiftfoot Boots or any other form of hexproof and haste on Auras or Equipment and this seems like a deliberate choice to prevent this exact scenario
By the way, since modified is a bit of a tricky keyword: Creatures under your control that have counters (of any type), auras that you control, or equipment (regardless of who controls said equipment) count as modified
Im confident that there has to be a way to break this card somehow, but it currently escapes me
On the other hand, if the table went on a Collective Voyage with you at the beginning of the game, they are going to be suffering rather painfully under the enchantment
On the front side, youre getting a decent body, some self-mill, and some enchantment recursion