Dual Nature

Symmetry is the joke and the trap. Every nontoken creature that touches the battlefield, yours or your opponent's, immediately spawns a copy, which doubles every enters-the-battlefield trigger on the board and turns each creature spell into a two-for-one. The catch is the tethering: tokens are bound to the original by name, so when the source creature dies or bounces, its copies are exiled along with it, and when the enchantment itself leaves, the whole pile of copies vanishes at once. Those two clauses are what stops the doubling from snowballing past the point of return. The structure rewards building around creatures whose entrance trigger is the entire point and whose body is incidental, because the entrance is the only value the enchantment lets you bank: the copy itself is on permanent loan, recallable the moment its original leaves play.

What lifts the card above curiosity is how cleanly it separates the value of an entrance from the value of a permanent. Most copy effects in green's history attach to a single creature; this one industrializes the process and applies it to the whole table, so the symmetry has to be broken by deckbuilding rather than by the card itself. It is a fragile engine: kill the enchantment and every copy on the board disappears, collapsing the position to its nontoken skeleton. The reward is steep when the originals stay put, but the leash is short, and the duplication cuts both ways the moment you stop choosing which entrances are worth it.