Whenever High Perfect Morcant or another Elf you control enters, each opponent blights 1. (They each put a -1/-1 counter on a creature they control.)
Tap three untapped Elves you control: Proliferate. Activate only as a sorcery. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Flood the board with Elves to grind opponents' creatures down with repeated blight triggers, then use the tap-three-Elves proliferate ability to multiply those -1/-1 counters into board-wide removal. You ramp hard with Elf mana-dorks, build a wide army, and either swing for lethal or proliferate counters until opponents have no blockers left.
Built-in incremental removal that taxes every opponent each time an Elf enters
Elf tribal has elite ramp, card draw, and flooding payoffs in green
Proliferate doubles as creature-wipe enabler and a synergy engine with other counters (+1/+1, planeswalkers, infect)
Cheap commander at 4 mana that immediately impacts the board
Blight only hits one creature per opponent and they choose it, so it's weak against token swarms or single-big-threat decks
Heavily creature-reliant; vulnerable to board wipes that erase your Elf engine
Black/green lacks counterspells and instant-speed interaction against combo
Proliferate is sorcery-speed and needs three untapped Elves, making it slow to come online
Legendary Creature — Elf Noble
