Sligh

Mono-red burn, also known as Sligh, with the cleanest curve in the format. The plan is brutally simple: deal 20 damage before your opponent stabilizes. Every card is either a creature that attacks for damage or a spell that deals damage directly.

Lightning Bolt is the best burn spell ever printed — three damage for one mana at instant speed. Incinerate is the backup at two mana. Fireblast is the free two-damage finisher: sacrifice two mountains to cast it for zero, letting you end games out of nowhere on turn 3–4.

Jackal Pup and Mogg Fanatic are the cheapest attackers. Pup is a 2/1 for one with a downside (you take 1 damage when it takes damage), but in a 20-life race it usually doesn’t matter. Fanatic trades with a creature or pings for one — reach.

Grim Lavamancer is the engine: it exiles two cards from your graveyard to deal two damage. In the mid-game it continuously pings creatures or the opponent, making it nearly impossible to stabilize behind small blockers.

Ball Lightning is a 6/1 trampler with haste for three mana. It dies at end of turn, but six damage in one swing often ends the game or forces a bad block.

Sulfuric Vortex is the metagame trump: it deals 2 damage to each player at their upkeep and prevents any player from gaining life. This turns off Swords to Plowshares, Renewed Faith, and any lifegain sideboard plan. Usually game-winning against control.

Price of Progress is the free win against multicolor decks: each nonbasic land deals 2 damage to its controller. Against Goblins (Karplusan Forest, Foothills, Wasteland) or Landstill (dual lands everywhere) this often deals 8–12 damage for two mana.