Haldir, Lórien Lieutenant

The counter count is doing double duty here, and that is the whole design. Poured onto the battlefield as an X-spell, the counters on this body set both its own size and the size of the anthem it later hands out: the +1/+1 it grants each other Elf scales one-for-one with what you paid on the way in. That coupling turns a lord effect into something that grows the more mana you sink into the initial cast, so a modest early drop and a haymaker top-deck are the same card. The activation cost sits high enough (six mana to fire) that the pump reads as a mana sink for a board already assembled rather than a combat trick you hold up, and vigilance on the whole team keeps that alpha strike from leaving you open. It is a rare shape for a green lord: most tribal anthems are static and fixed, printed as a flat number stapled to a creature. Tying the bonus to accumulated counters instead means the payoff answers directly to how invested the caster already is, and it gives an Elf deck a reason to protect the one permanent that decides how big everyone else swings.