Aeve, Progenitor Ooze

Storm on a green creature was always going to be a stranger animal than storm on a red burn spell or a blue draw engine, and this is the card that leaned all the way into that strangeness. The copies aren't cast: storm makes them directly on the stack, as tokens, which is why the card carves out the exception in its own text. Only the real Aeve is legendary, so the token copies stick around instead of collapsing under the legend rule. And here the sequencing is the whole trick: because the copies resolve before the original spell does, each of those Ooze tokens is already on the battlefield when the true Aeve enters, so the enters-with clause counts them and stacks a +1/+1 counter for each one. Chain enough spells before it and the original arrives as a genuine fatty on top of a board of smaller Oozes. That is a payoff for a deck that treats casting spells as a resource in itself, the same way ritual-and-draw shells always have, except the reward is a growing board of green bodies rather than a single game-ending trigger. The five-mana price with a triple-green pip is a real tax on a plan that also wants to spend mana building the storm count. What it represents is a rare instance of storm asking to be built around from the creature side, where the copies are bodies you keep, not damage you point.