Sunderflock

Nine mana printed, but nobody is meant to pay that. The reduction is a single lever, and it keys off the greatest mana value among your Elementals, not a count of them, so a board of one-drops trims only a single mana no matter how many you have. You have to actually resolve a large Elemental first; land one early and this flying 5/5 arrives for a sliver of its face, sweeping every non-Elemental creature back to hand as it lands. That the wipe is asymmetric by tribe, not by controller, is the elegant part: two Elemental decks staring across the table leave both battlefields untouched, while anyone else watches their whole side of the board vanish. Read the gating clause carefully, though, because it is doing quiet balancing work: the return only fires if you cast the spell. Reanimate it, blink it, or sneak it into play, and you skip the payoff entirely. You still get a flying 5/5, but the sweep, the reason to run the card, never happens. The design refuses to be shortcut. It wants the cost paid the honest way, off a threat already sitting on the board doing work, and it treats that as the toll for the tribal wrath.