You commit to this comp when you find Brann Bronzebeard, En-Djinn Blazer, and Acid Rainfall. En-Djinn Blazer's Battlecry adds a permanent layer to the Tavern's right-most slot: after every Refresh, whatever minion sits there gains +7/+7. This effect persists for the rest of the game. Each additional Battlecry proc stacks another layer — after 3 procs, the right-most minion gains +21/+21 on every single Refresh. With Brann doubling the Battlecry, each proc adds two layers instead of one. Acid Rainfall is the payoff: after 5 Refreshes, it absorbs all the stats from the right-most Tavern minion.
The engine that makes this explosive is Rylak Metalhead. A normal Rylak's Deathrattle triggers the Battlecry of one adjacent minion. A golden Rylak triggers both adjacent minions — this is why tripling Rylak is critical. Place golden Rylak between En-Djinn Blazer and Refreshing Anomaly — when it dies, it procs both simultaneously: En-Djinn stacks another layer of rightmost buffs, and Refreshing Anomaly gives 2 free Refreshes. Brann doubles both Battlecries, so each Rylak death adds +14/+14 per future Refresh AND generates 4 free Refreshes to immediately trigger those stacked buffs.
Monstrous Macaw multiplies everything. Its Rally effect triggers Rylak's Deathrattle on attack — without Rylak actually dying. Sprightly Scarab is the accelerator: give Rylak Reborn so it dies, procs, revives, and dies again for a double cycle. Give Macaw Windfury for two Rally procs per turn, or Reborn so it keeps attacking after death. Every keyword you add multiplies the entire chain. If you see Easterly Winds in the Tavern, always buy it — it adds the same permanent rightmost layer as En-Djinn Blazer's Battlecry.
Titus Rivendare doubles all Deathrattle effects. With Titus on board, every Rylak death fires its Deathrattle twice — double the En-Djinn stacks, double the free Refreshes. Combined with Macaw's Rally, Reborn, and Brann's Battlecry doubling, the multiplication is exponential. A single turn can produce dozens of En-Djinn stacks and dozens of free Refreshes.
In the final stage, add Flaming Enforcer as a second scaler. It consumes the highest-Health minion in the Tavern at end of turn, gaining its stats. Now two minions grow from the same pumped Tavern — you no longer depend on Acid Rainfall alone. Once your Tavern is full of pumped minions, start buying the best ones to strengthen your board — your engine has already done the work, now cash in the stats.
Because your stats are concentrated in one minion, you need to feel the lobby's power level. If opponents are scaling fast, you may need to stop the engine early and invest in board presence — a second Acid Rainfall, Flaming Enforcer, or extra bodies. Knowing when to stop scaling and start fighting is what separates a top 1-3 from a 4-6 place.
This build is also vulnerable to scam — Venomous minions, Divine Shield traders, and Leeroy can delete your massive Acid Rainfall in a single hit. If you see scam in the lobby, prioritize anti-scam minions to protect your carry. The comp requires Beasts in the lobby for Rylak and Macaw. Without Beasts, see the Pirate variant of this build.