Echo Storm

The reward here is entirely deferred: the base spell copies an artifact, a modest effect that would embarrass a five-mana sorcery on its own. The whole engine is the cast trigger, which counts how many times you've cast your commander from the command zone this game and copies the spell that many times. That tie to the command zone is a deliberate mechanical anchor: it only pays out in a deck built around a commander you recast repeatedly, and it punishes the commander tax obliquely by turning each recast into a stored multiplier for later. The copies let you choose new targets, so a board with several artifacts you'd like to duplicate is where the payoff lands: one cast becomes a fan of copies spread across the best pieces available. It belongs to a small design lineage of spells whose text does one thing but whose command-zone counter rewrites the ceiling based on your commander history, converting a build-around behavior you were already doing into raw card advantage. The friction is real: cast it too early and it's a middling artifact copy; wait for the counter to climb and you've committed five mana to a spell whose value scales with a play pattern you can't rush. That scaling, not the artifact clause, is the reason to run it, and it only makes sense in a shell already leaning on repeated commander casts.