Shizuko, Caller of Autumn

Green has been printing mana-doubling table effects since Vernal Bloom, and the trap is always the same: free acceleration handed to everyone is acceleration handed to your opponents. This snake threads that trap with a single unusual rider. Most symmetric ramp grants its mana the instant the spell resolves or as a static boost on lands, leaving it subject to the normal rule that unspent mana empties at the end of each step. Here the mana arrives at the top of each player's own upkeep and, crucially, sticks around until that player's turn ends. The persistence clause is doing the real work: it converts what would be a fleeting upkeep blip into three green mana every player gets to spend across their entire turn, at full sorcery speed, on their own terms. That is genuinely even, and the design makes no attempt to disguise it. The payoff for the controller is not a hidden asymmetry but raw velocity. If your deck is built to convert three extra green per turn faster or harder than the rest of the table (mana sinks, X-spells, an engine that wants to vomit out permanents before anyone catches up), you are the player most equipped to abuse a resource everyone shares. The 2/3 body is modest enough to slip under removal that hunts bigger threats, which suits a card whose plan is to outpace the symmetry rather than survive being singled out for it.