Wirewood Pride

For one green mana at instant speed, this scales its pump directly off your Elf count, which makes it less a combat trick than a payoff line for a board that has already committed. Onslaught block built Elves into a critical-mass tribe, and Wirewood Pride is the spell that turns that mass into a single lethal swing: in a wide enough board it doubles a creature's stats and then some, often punching through whatever the defender thought was a safe block. The cost structure is the interesting part. You pay nothing for the magnitude; the magnitude is paid for by having already developed the board, and it counts every Elf on the battlefield, not just your own, so the rare mirror can hand the effect to either side. That dependency is also the weakness. It does nothing meaningful when you most want a trick (an empty or stalled board reduces it to a marginal +1/+1 or worse), and it dies to the same removal that would have blown out your attacker anyway. It belongs to the family of count-the-tribe pump spells, the green tribal answer to the question of how to convert a flooded board into immediate damage without committing more cards to it. The reward is steep and the floor is low; whether that trade is worth a slot depends entirely on how reliably the board fills with Elves.