Staff of Titania

The scaling is the giveaway that this belongs to a very specific kind of green deck: the +X/+X reads off your total Forest count, so it sits inert until you have already bent your manabase hard toward Forests. What converts a static anthem into a self-feeding engine is the attack trigger. Every swing mints a Forest Dryad, and because that token carries the basic land type Forest, it counts toward the equipment's own math the instant it arrives. The buff is a static ability, so it recalculates immediately during the declare attackers step: the token enters, the Forest count ticks up, and the equipped creature is already larger before blockers are declared. The tokens are not disposable board filler; they are land creatures that tap for green like any other Forest, so each one ramps and widens the count in the same motion, even if summoning sickness keeps the fresh Dryad from attacking on the turn it appears. The equip cost of three is the governor on redeployment: if the equipped creature dies, moving the Staff elsewhere is not free, which keeps the loop from being weightless. This is a payoff piece for a lands-matter green shell that wants its permanents to double as the wincon, rewarding a board flooded with Forests in a way a flat pump could never: the more green sources you commit to, the harder the card compounds that commitment, once every turn the equipped creature declares an attack.