Eye of the Storm

The most dangerous word in this enchantment's text is "each." Every instant or sorcery anyone casts gets exiled and stored, and from then on each new spell copies all of them, free. The growth is not linear: the first spell copies one card, the second copies two, and the count compounds until a single cantrip detonates a stockpiled vault of accumulated sorceries. That makes it a symmetric trap that punishes whoever forgets they are sharing it; cast a Lightning Helix into an active Eye and you also fire every burn spell either player ever left in exile. The free-cast clause is what turns the engine combustible, because the copies arrive without mana, so the limiting factor is targets and triggers rather than resources. The catch is that it sits idle the turn it resolves and demands repeated feeding before it pays off, which is why it lives in dedicated build-arounds rather than fair decks: a spell that loots its own exiled copy, or a way to seed the pool with finishers, converts the slow ramp into a one-turn kill. It belongs to a particular branch of spell-copy design that treats the stack itself as a resource pile, where the cards in exile are not gone but waiting, and the player who understands the ordering of those waiting copies controls a board state that looks like chaos and is actually arithmetic.