Priest of Titania

Where Llanowar Elves and its kin tap for a fixed unit of green, this one scales: its output is a function of the board's Elf population, including itself, regardless of who controls those Elves or whether they can tap. That single design choice (an untapped Elf still counts) is what turns a tribe of mana dorks into an exponential ramp curve rather than a linear one. The math compounds fast, because every Elf you add raises the ceiling on every Elf already down, and this one is the multiplier sitting at the center of it. The body is fragile and the effect is symmetric in the trivial sense (your opponent's Elves count too, which almost never matters), but the real discipline is the summoning-sickness window: it has to survive a turn before it produces, so the payoff is always one tempo behind the threat it represents. That delay is the only honest brake on the rate. It established the template the tribe still runs on, the card every Elfball list builds toward before it ever casts a payoff, and the reason Heritage Druid and Elvish Archdruid later filled adjacent slots rather than replacing it.