Elves
Priest of Titania taps for one mana per elf in play, and this deck is full of elves. On her own she’s already making two or three mana. The untap pieces are what push her into broken territory. Quirion Ranger bounces a Forest to your hand to untap a creature, once per turn. Wirewood Symbiote returns an elf to your hand to untap a creature, also once per turn. With two Priests and both untappers you can generate absurd amounts of mana in a single turn—and the elves you bounce just get replayed. Plus you have Gaea’s Cradle.
Survival of the Fittest is the engine holding everything together. Squee, Goblin Nabob gives you a free tutor every turn, so often you want to pitch a mana dork to survival to find Squee early. Squee returns to your hand from the graveyard at the beginning of your upkeep, so you discard him to Survival, grab whatever you need, and he comes back next turn to do it again. Find Deranged Hermit for the squirrels, Masticore to clear blockers, or Anger, then pitch it to Survival to give your whole team haste.
Tangle Wire slows your opponents down, remember you can always tap the Wire itself as one of your permanents, so they’re down three lands while you’re only down two, and your elves are often extra lands anyway!
Deranged Hermit is your normal win condition, use your elves to make a lot of mana, Survival for Anger if you have a Mountain, then pitch Anger to Survival to get your hermit. If you can you can even bounce Deranged Hermit (it’s an elf) with Wirewood Symbiote and replay it to make even more hasty 2/2 squirrels. Or just pitch another creature to survival to get another hermit.
Maindeck
Sideboard
Sideboarding Thoughts
Wall of Blossoms: A 0/4 that draws a card when it enters. Bring in against aggressive creature decks where you need to stop early attackers. It shuts down Goblin Lackey cold and denies the “attack, put a big goblin into play for free” plan while replacing itself in hand.
Caller of the Claw: Insurance against mass removal. If your board of mana elves gets wiped by something like Pyrokinesis, Caller immediately makes 2/2 bears for every non-token that just died, turning a board sweep into a recovery.
Naturalize: Essential against problem permanents like Sphere of Resistance (taxes every spell), Oath of Druids (triggers off your creatures), or any enchantment lock.
Uktabi Orangutan: A creature that destroys an artifact when it enters the battlefield, so Survival of the Fittest can find it on demand.
Xantid Swarm: Great against counter-heavy decks like Stiflenought and Psychatog: while it’s attacking your opponent can’t cast spells during your turn. Swing it in, then resolve Survival, deploy elves, and cast Tangle Wire with no countermagic possible. Play your spells in second main after the attack step.
Masticore: An extra copy of the main deck Masticore for matchups where you need sustained repeatable damage or a resilient threat that’s hard to answer.