Menace (This creature can't be blocked except by two or more creatures.)
When Harald enters, look at the top five cards of your library. You may reveal an Elf, Warrior, or Tyvar card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
Flood the board with Elves and Warriors, ramp hard with Elvish mana dorks, then alpha strike or pump the team for a wide lethal swing. Harald cantrips into your best tribal cards on each cast, so you reuse him through cheap recursion to dig for threats. The deck snowballs from explosive mana into overwhelming board presence by the midgame.
Excellent mana acceleration from a deep pool of Elf dorks, enabling fast, explosive starts
Built-in card advantage from Harald's ETB that refills your hand with tribal payoffs
Goes both wide (tokens) and tall (anthems/overruns), giving multiple lines to victory
Black gives recursion, removal, and tutors that mono-green elves lack
Extremely vulnerable to board wipes that punish a wide, low-toughness board
Relies on creature-based mana, so artifact/creature destruction sets you back hard
Harald's selection is narrow (only Elf/Warrior/Tyvar), so non-tribal slots are dead to it
Can struggle to interact with combo decks racing to win before you connect
Flexible Warrior that handles artifacts, enchantments, or buys time, fitting the tribal subtheme.
Add fast mana and tutors—Survival of the Fittest, Worldly Tutor, and Sylvan Library—to consistently find your payoffs and finishers. Tighten the mana base with dual lands and protect your board with Heroic Intervention and Tabletop curse-style insurance against wipes. Prioritize the best overruns (Craterhoof, Triumph of the Hordes for infect) and ramp-to-win lines like Ezuri or Elvish Archdruid loops to raise the deck's ceiling.